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

Odds updated as of 7:11 p.m.

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

Before checking out the MLB betting lines on FanDuel Sportsbook, we've got you covered, in terms of the vital info regarding this game.

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: (-134) | CHW: (+114)
• Spread: SEA: -1.5 (+122) | CHW: +1.5 (-146)
• Total: 9.5 -- 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

The Mariners will call on Luis Castillo (0-3) versus the White Sox and Anthony Kay (1-1). Castillo's team is 1-6-0 against the spread in his starts this season. Castillo's team has won 16.7% of his starts when they are favored on the moneyline (1-5). The White Sox are 2-2-0 ATS in Kay's four starts with a set spread. The White Sox have been the underdog on the moneyline in four of Kay's starts this season, and they went 1-3 in those matchups.

Mariners vs White Sox Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (60.4%)

Mariners vs White Sox Moneyline

• The Mariners vs White Sox moneyline has Seattle as a -134 favorite, while Chicago is a +114 underdog at home.

Mariners vs White Sox Spread

• The Mariners are 1.5-run road favorites on the runline against the White Sox. The Mariners are +122 to cover, and the White Sox are -146.

Mariners vs White Sox Over/Under

• Mariners versus White Sox, on May 9, has an over/under of 9.5, with the over being -105 and the under -115.

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

Mariners vs White Sox Betting Trends

• The Mariners have been chosen as favorites in 35 games this year and have walked away with the win 18 times (51.4%) in those games.
• Seattle has a record of 16-9 when favored by -134 or more this year.
• Contests with the Mariners have gone over the total set by sportsbooks in 18 of 39 chances this season.
• The Mariners are 14-25-0 against the spread in their 39 games with a line set by sportsbooks this season.
• The White Sox have put together a 14-18 record in games they were the underdog on the moneyline (winning 43.8% of those games).
• In games it has played as a moneyline underdog with odds of +114 or longer, Chicago has a 12-15 record (winning 44.4% of its games).
• The White Sox have combined with opponents to go over the total 19 times this season for a 19-17-0 record against the over/under.
• The White Sox are 19-17-0 ATS this season.

Mariners Player Leaders

• Randy Arozarena has nine doubles, a triple, three home runs and 17 walks while batting .279. He has an on-base percentage of .368 and a slugging percentage of .421.
• Among qualifying hitters in MLB, his batting average ranks 40th, his on-base percentage ranks 43rd, and he is 68th in slugging.
• Arozarena has hit safely in two straight games. During his last five outings he is batting .263 with a walk.
• Julio Rodriguez leads Seattle with 41 hits and a team-best slugging percentage of .426. He's batting .265 with an on-base percentage of .329.
• His batting average is 64th among qualified players, his on-base percentage 97th, and his slugging percentage 66th.
• Rodriguez enters this matchup looking to extend his two-game hit streak. In his last five games 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 has recorded at least one base hit in seven games in a row. During his last 10 outings he is batting .341 with a double, two home runs, two walks and nine RBIs.
• J.P. Crawford leads Seattle with an OBP of .376 this season while batting .210 with 26 walks and 19 runs scored.

White Sox Player Leaders

• Munetaka Murakami has totaled 32 hits with a .370 on-base percentage, leading the White Sox in both statistics. He's batting .237 and slugging .578.
• He ranks 108th in batting average, 39th in on-base percentage and ninth in slugging percentage among all qualified hitters in the majors.
• 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.
• He is currently 139th in batting average, 57th in on-base percentage and 68th in slugging percentage among all qualified batters.
• Colson Montgomery is batting .226 with eight doubles, nine home runs and 15 walks.
• Chase Meidroth is slugging .380 to lead his team.

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)

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