Mets vs Diamondbacks Prediction, Odds, Moneyline, Spread & Over/Under for May 9

Odds updated as of 7:11 p.m.

Saturday's slate in the MLB includes a matchup between the New York Mets and the Arizona Diamondbacks.

Before checking out the MLB betting lines on FanDuel Sportsbook, we've got you covered, in terms of the most important info about this matchup.

Mets vs Diamondbacks Game Info

• New York Mets (15-23) vs. Arizona Diamondbacks (17-20)
• Date: Saturday, May 9, 2026
• Time: 7:15 p.m. ET
• Venue: Chase Field -- Phoenix, Arizona
• Coverage: FOX

Mets vs Diamondbacks Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: NYM: (-136) | ARI: (+116)
• Spread: NYM: -1.5 (+118) | ARI: +1.5 (-142)
• Total: 8.5 -- Over: (-120) | Under: (-102)

Mets vs Diamondbacks Probable Starting Pitchers

Probable Pitchers: Clay Holmes (Mets) - 4-2, 1.69 ERA vs Merrill Kelly (Diamondbacks) - 1-3, 9.95 ERA

This contest's pitching matchup is set, as the Mets will send Clay Holmes (4-2) to the mound, while Merrill Kelly (1-3) will take the ball for the Diamondbacks. Holmes' team is 4-3-0 against the spread in his starts this season. When Holmes starts a game and his team is the favorite on the moneyline, they have a record of 4-1. The Diamondbacks have a 1-3-0 ATS record in Kelly's four starts with a set spread. The Diamondbacks have a 1-2 record in Kelly's three starts this season when they were the underdog on the moneyline.

Mets vs Diamondbacks Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mets win (51.3%)

Mets vs Diamondbacks Moneyline

• Looking at the moneyline for Mets-Diamondbacks, New York is the favorite at -136, and Arizona is +116 playing at home.

Mets vs Diamondbacks Spread

• The Diamondbacks are +1.5 on the spread (-142 to cover), and New York is +118 to cover the runline.

Mets vs Diamondbacks Over/Under

• Mets versus Diamondbacks, on May 9, has an over/under of 8.5, with the over being -120 and the under -102.

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Mets vs Diamondbacks Betting Trends

• The Mets have been favorites in 30 games this season and have come away with the win 13 times (43.3%) in those contests.
• This season New York has come away with a win eight times in 22 chances when named as a favorite of at least -136 on the moneyline.
• The Mets' games have gone over the total in 14 of their 38 opportunities.
• The Mets have an against the spread mark of 14-24-0 in 38 games with a line this season.
• The Diamondbacks have been the moneyline underdog 25 total times this season. They've finished 9-16 in those games.
• Arizona has a record of 6-7 in games it has played as a moneyline underdog with odds of +116 or longer (46.2%).
• The Diamondbacks have played in 37 games with an over/under set, and have combined with their opponents to go over the total 20 times (20-15-2).
• The Diamondbacks have a 23-14-0 record ATS this season (covering 62.2% of the time).

Mets Player Leaders

• Juan Soto is batting .282 with four doubles, a triple, four home runs and 13 walks. He has an on-base percentage of .374 while slugging .494.
• Bo Bichette leads New York in slugging percentage (.301) thanks to seven extra-base hits. He's batting .231 with an on-base percentage of .269.
• Among qualifiers, he ranks 118th in batting average, 161st in on-base percentage and 163rd in slugging percentage.
• Marcus Semien is batting .228 with a .316 slugging percentage and 13 RBI this year.
• Mark Vientos has been key for New York with 24 hits, an OBP of .287 plus a slugging percentage of .440.

Diamondbacks Player Leaders

• Ildemaro Vargas has racked up 42 hits with a .374 on-base percentage and a .597 slugging percentage, all club-bests for the Diamondbacks. He's batting .353.
• He ranks first in batting average, 36th in on-base percentage and seventh in slugging percentage among all qualifying batters in the majors.
• Corbin Carroll has eight doubles, four triples, five home runs and 18 walks while batting .266. He's slugging .516 with an on-base percentage of .363.
• He is currently 61st in batting average, 51st in on-base percentage and 27th in slugging percentage among all qualifying hitters.
• Geraldo Perdomo is hitting .224 with five doubles, three triples, two home runs and 22 walks.
• Nolan Arenado has three doubles, six home runs and eight walks while hitting .271.

Mets vs Diamondbacks Head to Head

• 5/8/2026: 3-1 NYM (Favorite: Mets, Spread: -1.5, Total: 8.5, Favorite Moneyline: -136, Underdog Moneyline: +116)
• 4/9/2026: 7-1 ARI (Favorite: Mets, Spread: -1.5, Total: 6.5, Favorite Moneyline: -190, Underdog Moneyline: +160)
• 4/8/2026: 7-2 ARI (Favorite: Mets, Spread: -1.5, Total: 7.5, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 4/7/2026: 4-3 NYM (Favorite: Mets, Spread: -1.5, Total: 7, Favorite Moneyline: -154, Underdog Moneyline: +130)
• 5/7/2025: 7-1 NYM (Favorite: Mets, Spread: -1.5, Total: 9, Favorite Moneyline: -116, Underdog Moneyline: -102)
• 5/6/2025: 5-1 ARI (Favorite: Diamondbacks, Spread: -1.5, Total: 9, Favorite Moneyline: -110, Underdog Moneyline: -106)
• 5/5/2025: 5-4 NYM (Favorite: Diamondbacks, Spread: -1.5, Total: 9.5, Favorite Moneyline: -116, Underdog Moneyline: -102)
• 5/1/2025: 4-2 ARI (Favorite: Mets, Spread: -1.5, Total: 8, Favorite Moneyline: -164, Underdog Moneyline: +138)
• 4/30/2025: 4-3 ARI (Favorite: Diamondbacks, Spread: -1.5, Total: 8.5, Favorite Moneyline: -112, Underdog Moneyline: -104)
• 4/29/2025: 8-3 NYM (Favorite: Mets, Spread: -1.5, Total: 8, Favorite Moneyline: -142, Underdog Moneyline: +120)

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