These are Yahoo's top adds for May 21—the largest day-over-day ownership gainers across all leagues.

STREAM Dillon Dingler

C · DET · 66% owned (▲ +1.0pp day-over-day)

Why he's being added Dingler is Detroit's primary catcher and carries an elite Statcast case for regression to the mean. Over 178 plate appearances, his 0.234 batting average sits 15 points below his xBA (0.296), but the more telling gap is xwOBA 0.396 vs. wOBA 0.355 (+41bp edge)—a 13.2% Barrel rate and 48.8% hard-hit rate suggest his 0.443 slugging percentage is being suppressed by sequencing luck. With a season 0.247 BABIP (nearly 30 points below league average), his .234 BA should normalize upward sharply once contact quality catches up to batting average. Last 14 days: 12G, 9-for-52 (.173) with 2 HR and 6 R—a slump, but rooted in timing rather than skill decline.

Last 7 days 🟢4 05-14 🟢2 05-15 🟢2 05-16 🟢2 05-17 🟢3 05-18 🟢4 05-19 🟢3 05-20

Conviction meter Avoid ░░░░░░▓▓▓▓ Stream · 75% — elite underlying metrics

Verdict: Stream Dingler as a regression target with full-time ABs and elite contact quality (xwOBA +41bp) signaling an imminent AVG rebound.

STREAM Carson Benge

OF · NYM · 31% owned (▲ +2.0pp day-over-day)

Why he's being added Benge is the primary left fielder in NYM's corner-OF platoon and just posted a 13-game stretch with a .362 batting average (21-for-58, 2 SB, 11 R)—the sharpest offensive run on today's board. Over 172 PA this season, his 0.264 AVG masks a xwOBA (0.319) exceeding wOBA (0.238) by +81bp, paired with a season 0.250 BABIP well below his contact profile. The 6.6% Barrel rate is modest, but 43.4% hard-hit rate and that xwOBA edge suggest sequencing luck has been brutal; the L14 spike (0.362 AVG, 11 R in 13G) is exactly what unlucky-BABIP players deliver when variance normalizes. With 8 SB on 172 PA (seasonal pace of 23 SB), Benge offers dual upside in a platoon role.

Last 7 days 🟢1 05-14 🟢1 05-15 🟢1 05-16 🟢1 05-17 🟢1 05-18 🟢1 05-19 🟢1 05-20

Conviction meter Avoid ░░░░░░▓▓▓▓ Stream · 78% — BABIP unlucky, xwOBA edge

Verdict: Stream Benge as a BABIP-unlucky bat with a +81bp Statcast edge and elite speed in a corner-OF role; L14 .362 AVG is a leading indicator of AVG stabilization.

WATCH Zack Gelof

3B · ATH · 22% owned (▲ +2.0pp day-over-day)

Why he's being added Gelof is the primary 3B starter at Oakland and has logged 7 straight games in the batting order (05-14 through 05-20), a signal of role lock after earlier platoon uncertainty. Over 107 PA this season, his 0.255 BA reflects a modest 0.257 xBA, but a 0.480 slugging percentage (11.1% Barrel rate, 45.8% HH%) points to power upside if his .305 ISO continues. Last 14 days: 13G, 13-for-55 (.236) with 4 HR and 9 R—modest average but power output (4 HR in 55 PA = 10 HR pace) suggests offensive contributions are arriving. Ownership bump is likely driven by the consistent recent lineup presence rather than a statistical inflection.

Last 7 days 🟢7 05-14 🟢6 05-15 🟢6 05-16 🟢6 05-17 🟢8 05-18 🟢6 05-19 🟢6 05-20

Conviction meter Avoid ░░░░▓▓░░░░ Stream · 40% — role-locked starter but light sample

Verdict: Watch Gelof as a role-locked starter with power tools (11.1% Barrel%, 0.480 SLG) but a modest 107 PA sample and .236 L14 average—more of a monitor-for-upside than an immediate add.

WATCH Ezequiel Duran

OF · TEX · 34% owned (▲ +1.0pp day-over-day)

Why he's being added Duran was listed as a #1 left fielder in Texas' depth chart and has started 6 of the last 7 games (05-15 through 05-20), signaling a recent promotion into regular playing time. Over 120 PA this season, a 0.274 AVG and 0.453 SLG profile is solid for a 24-year-old corner outfielder, and his xwOBA (0.324) sits close to wOBA (0.349), suggesting no egregious luck. Last 14 days: 13G, 16-for-56 (.285) with 3 HR and 13 RBI—a strong recent stretch that drove the ownership bump. However, 120 PA remains a light sample, and his xBA (0.268) trails actual BA (0.274) slightly, indicating his AVG could be due for modest regression.

Last 7 days ⬜ 05-14 🟢2 05-15 🟢5 05-16 🟢5 05-17 🟢6 05-18 🟢5 05-19 🟢5 05-20

Conviction meter Avoid ░░░░▓▓░░░░ Stream · 45% — regular PT but light season sample

Verdict: Watch Duran as a promoted depth outfielder with recent lineup consistency (6 of 7) and a solid 0.798 OPS, but do not add until the 120 PA sample balloons or his xwOBA edge widens.

AVOID Brayan Rocchio

SS · CLE · 44% owned (▲ +1.0pp day-over-day)

Why he's being added Rocchio is the primary shortstop at Cleveland and has logged 6 straight games in the lineup (05-15 through 05-20) following an earlier 05-14 off-day. Over 185 PA this season, a 0.277 AVG and 0.366 OBP with 8 SB offers dual contributions, but the Statcast profile is a red flag: xwOBA (0.325) trails wOBA (0.340) by −15bp, suggesting his batting average has benefited from lucky sequencing. A 2.8% Barrel rate (among the lowest on today's board) and 30.2% HH% point to weak contact quality that's been masked by BABIP—likely the source of the 0.277 AVG. Over 185 PA, ownership has climbed despite deteriorating underlying metrics, a classic waiver-buzz disconnect.

Last 7 days ⬜ 05-14 🟢9 05-15 🟢9 05-16 🟢9 05-17 🟢9 05-18 🟢9 05-19 🟢9 05-20

Conviction meter Avoid ▓▓▓░░░░░░░ Stream · 25% — xwOBA negative, weak contact

Verdict: Avoid Rocchio despite the role-lock and recent playing time; xwOBA −15bp + 2.8% Barrel rate signal AVG regression is imminent as BABIP luck reverses.

AVOID Nolan Arenado

3B · AZ · 34% owned (▲ +2.0pp day-over-day)

Why he's being added No clear catalyst in the data—likely speculative add riding Arenado as a proven veteran and rotation starter. Over 171 PA this season, a 0.278 AVG and 0.828 OPS profile is solid, and his xwOBA (0.339) tracks close to wOBA (0.351), indicating no egregious luck. However, a 7.5% Barrel rate and 30.0% HH% are below-average for a player of his pedigree, and the L14 line (12G, 11-for-48, 0.229 AVG, 2 HR) shows recent slump. The most recent bubbles include a 05-20 bench day (🔴 B), suggesting reduced confidence or rest.

Last 7 days ⬜ 05-14 🟢4 05-15 🟢4 05-16 🟢4 05-17 🟢• 05-18 🟢4 05-19 🔴 B 05-20

Conviction meter Avoid ▓▓▓░░░░░░░ Stream · 28% — name recognition, no catalyst

Verdict: Avoid Arenado; the 171 PA season sample shows no edge (xwOBA matching wOBA), and the L14 slump (.229 AVG, 2 HR) coupled with a 05-20 bench day suggests recent momentum is negative, not positive.

AVOID Anthony Volpe

SS · NYY · 9% owned (▲ +1.0pp day-over-day)

Why he's being added Volpe is listed as the #1 shortstop in NYY's depth chart but could potentially be filling in only short-term for Jose Caballero - anticipated to return this week. The xwOBA (0.362) is elite, but with only 27 PA and a 0.250 AVG, the sample is speculative. The 05-18 through 05-20 bubble string (🟢7, 🟢7, 🟢8) shows consistent lineup presence over the last 3 days, a potential positive, but his recent offensive output does not support the ownership bump.

Last 7 days ⬜ 05-14 🟢8 05-15 🟢8 05-16 🟢8 05-17 🟢7 05-18 🟢7 05-19 🟢8 05-20

Conviction meter Avoid ▓▓▓▓░░░░░░ Stream · 30% — 27 PA sample, .185 L14 AVG

Verdict: Avoid Volpe; despite an elite xwOBA (0.362), the 27 PA season sample and .185 L14 AVG place him squarely in speculation territory—no MLB track record yet.

WATCH Jake Bauers

OF · MIL · 31% owned (▲ +2.0pp day-over-day)

Why he's being added Bauers is taking regular reps in the OF for the Brew Crew. Over 146 PA this season, a 0.275 AVG and 0.830 OPS mask an xwOBA (0.362) exceeding wOBA (0.378)—a positive Statcast edge of −16bp (xwOBA trails wOBA), but the 12.7% Barrel rate and 54.5% HH% are elite for a bench bat. Last 14 days: 8G, 13-for-34 (.382) with 2 HR and 9 RBI—a hot stretch, but across only 8 games in a depth role. Consistent bubble presence (🟢4, 🔴 B, 🟢•, 🟢6, 🟢6, 🟢6 over 05-15 through 05-20) shows recent playing time is sporadic.

Last 7 days 🔴 B 05-14 🟢4 05-15 🔴 B 05-16 🟢• 05-17 🟢6 05-18 🟢6 05-19 🟢6 05-20

Conviction meter Avoid ░░░░▓▓░░░░ Stream · 42% — elite contact, depth role limits ABs

Verdict: Watch Bauers as a potential regular bat with elite contact quality (54.5% HH%, 12.7% Barrel%) and a .382 L14 AVG, but do not add—his #3 depth ranking guarantees sporadic ABs in a healthy MIL outfield.

WATCH Carson Kelly

C · CHC · 14% owned (▲ +1.0pp day-over-day)

Why he's being added Kelly is the primary catcher at CHC and has shown recent consistent lineup presence (🟢7, 🟢7, 🟢9, 🟢5 over 05-15 through 05-20, with two benches mixed in 05-14 and 05-16). Over 134 PA this season, a 0.297 AVG and 0.779 OPS profile is solid for a catcher, but the Statcast edge is negative: xwOBA (0.335) trails wOBA (0.390) by −55bp, a significant gap suggesting his 0.297 AVG is being propped up by luck. A 8.6% Barrel rate is modest, and the L14 line (9G, 7-for-30, 0.233 AVG, 0 HR) shows recent offensive slump. The ownership bump likely reflects his role-lock, not underlying skill improvement.

Last 7 days 🔴 B 05-14 🟢7 05-15 🔴 B 05-16 🟢• 05-17 🟢7 05-18 🟢9 05-19 🟢5 05-20

Conviction meter Avoid ░░░▓░░░░░░ Stream · 32% — xwOBA−55bp, role-lock only upside

Verdict: Watch Kelly; while he holds a role-lock at catcher, the −55bp xwOBA gap and L14 slump (.233 AVG) signal AVG regression ahead—monitor for improvement before adding.

AVOID Dominic Smith

1B · ATL · 4% owned (▲ +1.0pp day-over-day)

Why he's being added Smith is the primary DH in ATL's lineup with injuries to their #1 and #2 catchers (Baldwin and Murphy, respectively) and carries an eye-catching 0.337 AVG and 0.903 OPS over 106 PA this season, fueling a modest ownership bump from an ultra-low floor (3% previously). His xwOBA (0.378) lags wOBA (0.410) by −32bp, a red flag suggesting his outsized average is luck-driven rather than repeatable. Over 106 PA, the sample is light, and a 8.6% Barrel rate is below-average for a slugger. Last 14 days: 11G, 10-for-28 (.357) with 1 HR and 4 RBI—strong, but a recent 🔴 B on 05-16 and 🟢• (no batting order, likely DH game) on 05-19 hint at sporadic usage despite the starter label.

Last 7 days 🟢7 05-14 🟢• 05-15 🔴 B 05-16 🟢6 05-17 🟢7 05-18 🟢• 05-19 🟢5 05-20

Conviction meter Avoid ▓▓░░░░░░░░ Stream · 20% — xwOBA−32bp, luck-driven AVG

Verdict: Watch Smith; despite a shiny 0.903 OPS, the −32bp xwOBA gap signals his 0.337 AVG is unsustainable and likely to regress sharply as BABIP normalizes.

AVOID Tony Santillan

RP · CIN · 12% owned (▲ +1.0pp day-over-day)

Why he's being added Santillan is a middle reliever (RP #4) with 2 saves on the season, and the modest ownership bump likely reflects waiver-wire desperation in shallower leagues seeking any save opportunity. However, the underlying data is a sell signal: 5.21 ERA (21 IP, 19 G) masks a 6.01 xERA and a 7.03 FIP, indicating his ERA has been propped up by sequencing luck and is due to climb sharply. A fastball velo down 2.3 mph vs. his prior season (per the signal drivers) combined with Stuff+ 86 (below-average) suggests his stuff isn't sustaining success—the 17.42 ERA over L14 (5 G, 3.1 IP) is a harbinger of ongoing volatility. Injuries have opened the door in Ohio as Santillan has been called on a few times for save opportunities. I would rather Pierece Johnson right now.

Last 7 days 🔴 B 05-14 🟢• 05-15 🔴 B 05-16 🔴 B 05-17 🔴 B 05-18 🟢• 05-19 🔴 B 05-20

Conviction meter Avoid ▓░░░░░░░░░ Stream · 8% — xERA>ERA, velo loss, Stuff+ 86

Verdict: Avoid Santillan as a strong sell; xERA 6.01 + FIP 7.03 both exceed his 5.21 ERA, velocity loss, and below-average stuff signal his hold on saves is unsustainable.

AVOID Keibert Ruiz

C · WSH · 13% owned (▲ +1.0pp day-over-day)

Why he's being added Ruiz is the #2 catcher at WSH (platoon/backup role) and has logged recent irregular playing time (🔴 B, 🔴 B, 🟢7, 🟢8, 🔴 B, 🔴 B, 🟢9 over 05-14 through 05-20)—a backup's cadence, not a starter's. Over 97 PA this season, a 0.250 AVG and 0.768 OPS is modest, and his xwOBA (0.247) trails wOBA (0.237) by only −18bp—a marginal difference. However, the L14 line (7G, 11-for-28, 0.392 AVG, 3 HR, 13 RBI) is an outlier: 3 HR in 7 games is unsustainable power, and a 0.217 BABIP across 97 PA season ABs indicates sequencing luck is driving the L14 spike. The platoon-role designation limits playing-time upside.

Last 7 days 🔴 B 05-14 🔴 B 05-15 🟢7 05-16 🟢8 05-17 🔴 B 05-18 🔴 B 05-19 🟢9 05-20

Conviction meter Avoid ▓▓▓░░░░░░░ Stream · 22% — platoon role, BABIP-driven L14

Verdict: Avoid Ruiz; despite a steamy .392 L14 AVG, his platoon role, sub-0.250 AVG season baseline, and 0.217 BABIP all signal the 3 HR spike is a statistical mirage with no staying power.

WATCH Richard Lovelady

RP · WSH · 1% owned (▲ +1.0pp day-over-day)

Why he's being added Lovelady is a middle reliever (RP #6) with 3 saves on the season and has logged 6 games over the last 14 days with a 3.33 ERA (5.4 IP, 7 K)—modest recent output that likely does not explain the ownership jump. However, his 2.61 ERA over 20.2 IP this season carries a 4.51 xERA, indicating luck has been extreme: his actual ERA is 190bp better than deserved. A 6.1 BB/9 (elevated) and 8.7 K/9 (modest) profile suggests his hold on any save opportunity is fragile. The 3 saves over 19 G (team not pursuing many save situations, or Lovelady is not the primary closer) limits upside.

Last 7 days 🔴 B 05-14 🟢• 05-15 🔴 B 05-16 🟢• 05-17 🔴 B 05-18 🟢• 05-19 🔴 B 05-20

Conviction meter Avoid ▓▓░░░░░░░░ Stream · 20% — ERA>xERA, minimal save path

Verdict: Watch Lovelady; while his 2.61 ERA is eye-catching, the 4.51 xERA indicates his luck is running hot, he seems to be offering some consistent save opportunities if desparate.

WATCH Gabriel Moreno

C · AZ · 31% owned (▲ +2.0pp day-over-day)

Why he's being added Moreno is the primary catcher at Arizona and carries a 101 PA season sample with a 0.253 AVG and 0.703 OPS—modest offensive output that belies his role security. However, his xwOBA (0.333) exceeds wOBA (0.315) by +18bp, and a 11.3% Barrel rate with 42.3% HH% suggest underlying contact quality is solid. The L14 line (10G, 9-for-40, 0.225 AVG, 1 HR) shows recent offensive struggle, and a 05-20 bench day (🔴 B) is a potential red flag. His recent bubble string (🟢7, 🔴 B, 🟢7, 🟢6, 🟢7, 🔴 B) indicates sporadic playing time or rest rotation, unusual for a stated starter.

Last 7 days ⬜ 05-14 🟢7 05-15 🔴 B 05-16 🟢7 05-17 🟢6 05-18 🟢7 05-19 🔴 B 05-20

Conviction meter Avoid ░░░░░▓░░░░ Stream · 35% — role-lock but sparse ABs, L14 slump

Verdict: Watch Moreno; his role-lock and +18bp xwOBA edge offer upside, but the 0.703 OPS, sparse recent ABs (two bench days in L7), and L14 slump (.225 AVG) argue for monitoring before adding.