Mariners vs White Sox Prediction, Odds, Moneyline, Spread & Over/Under for May 9

Odds updated as of 2:11 a.m.

On Saturday in MLB, the Seattle Mariners are playing the Chicago White Sox.

We've got you covered, in terms of the most important information about this matchup before you take a look at the MLB odds and spreads on FanDuel Sportsbook.

Mariners vs White Sox Game Info

• Seattle Mariners (19-20) vs. Chicago White Sox (17-21)
• Date: Saturday, May 9, 2026
• Time: 7:10 p.m. ET
• Venue: Rate Field -- Chicago, Illinois
• Coverage: CHSN and Mariners.TV

Mariners vs White Sox Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-138) | CHW: (+118)
• Spread: SEA: -1.5 (+120) | CHW: +1.5 (-144)
• Total: 9 -- Over: (-105) | Under: (-115)

Mariners vs White Sox Probable Starting Pitchers

Probable Pitchers: Luis Castillo (Mariners) - 0-3, 6.29 ERA vs Anthony Kay (White Sox) - 1-1, 5.70 ERA

This contest's pitching matchup is set, as the Mariners will send Luis Castillo (0-3) to the mound, while Anthony Kay (1-1) will get the nod for the White Sox. Castillo and his team are 1-6-0 ATS this season when he starts. Castillo's team has been victorious in 16.7% of the games he's started as the moneyline favorite with a record of 1-5. The White Sox are 2-2-0 against the spread when Kay starts. The White Sox have been the moneyline underdog in four of Kay's starts this season, and they went 1-3 in those games.

Mariners vs White Sox Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (66.7%)

Mariners vs White Sox Moneyline

• Seattle is a -138 favorite on the moneyline, while Chicago is a +118 underdog at home.

Mariners vs White Sox Spread

• The White Sox are +1.5 on the spread (-144 to cover), and Seattle is +120 to cover the runline.

Mariners vs White Sox Over/Under

• The Mariners-White Sox game on May 9 has been given an over/under of 9 runs. The over is set at -105 and the under at -115.

Bet on Seattle Mariners vs. Chicago White Sox on FanDuel today!

Mariners vs White Sox Betting Trends

• The Mariners have come away with 18 wins in the 35 contests they have been listed as the favorites in this season.
• Seattle has a record of 11-8 in contests when sportsbooks favor them by -138 or more on the moneyline.
• The Mariners and their opponents have hit the over in 18 of their 39 games with a total set by oddsmakers this season.
• The Mariners have an against the spread mark of 14-25-0 in 39 games with a line this season.
• The White Sox have won 43.8% of the games this season they were the moneyline underdog (14-18).
• Chicago has a 12-14 record (winning 46.2% of its games) when playing as a moneyline underdog of +118 or longer.
• The White Sox have combined with opponents to hit the over on the total 19 times this season for a 19-17-0 record against the over/under.
• The White Sox have covered 52.8% of their games this season, going 19-17-0 ATS.

Mariners Player Leaders

• Randy Arozarena is batting .279 with nine doubles, a triple, three home runs and 17 walks. He has an on-base percentage of .368 while slugging .421.
• Among qualified hitters, he ranks 40th in batting average, his on-base percentage ranks 43rd, and he is 68th in slugging.
• Arozarena hopes to build on a two-game hitting streak in this matchup. During his last five outings he is batting .263 with a walk.
• Julio Rodriguez has 41 hits to go with a slugging percentage of .426, both of which are best among Seattle hitters this season. He's batting .265 with an on-base percentage of .329.
• He ranks 64th in batting average, 97th in on-base percentage and 66th in slugging in MLB.
• Rodriguez has picked up at least one hit in two straight games. During his last five outings he is hitting .238 with two home runs, a walk and two RBIs.
• Josh Naylor has 35 hits this season and has a slash line of .246/.308/.373.
• Naylor brings a seven-game hitting streak into this matchup. During his last 10 games he is hitting .341 with a double, two home runs, two walks and nine RBIs.
• J.P. Crawford leads Seattle in OBP (.376) this season, fueled by 22 hits.

White Sox Player Leaders

• Munetaka Murakami has put up an on-base percentage of .370 and has 32 hits, both team-best marks for the White Sox. He's batting .237 and slugging .578.
• Including all qualified players in the majors, he is 108th in batting average, 39th in on-base percentage and ninth in slugging percentage.
• Miguel Vargas is hitting .218 with four doubles, a triple, seven home runs and 27 walks. He's slugging .421 with an on-base percentage of .360.
• Including all qualified hitters, his batting average places him 139th, his on-base percentage ranks 57th, and he is 68th in slugging.
• Colson Montgomery is batting .226 with eight doubles, nine home runs and 15 walks.
• Chase Meidroth leads his team with a .380 slugging percentage.

Mariners vs White Sox Head to Head

• 5/8/2026: 12-8 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -142, Underdog Moneyline: +120)
• 8/7/2025: 4-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -295, Underdog Moneyline: +240)
• 8/6/2025: 8-6 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -270, Underdog Moneyline: +220)
• 8/5/2025: 8-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -250, Underdog Moneyline: +205)
• 5/21/2025: 6-5 SEA (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -146, Underdog Moneyline: +124)
• 5/19/2025: 5-1 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -188, Underdog Moneyline: +158)
• 7/28/2024: 6-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 7/27/2024: 6-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -154, Underdog Moneyline: +130)
• 7/26/2024: 10-0 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -174, Underdog Moneyline: +146)
• 6/13/2024: 3-2 CHW (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -108, Underdog Moneyline: -108)

Sign up for FanDuel Sportsbook and FanDuel Daily Fantasy today!