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

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

Moneyline: SEA: (-138) | CHW: (+118)
Spread: SEA: -1.5 (+122) | CHW: +1.5 (-146)
Total: 9 — Over: (-105) | Under: (-115)

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

The Mariners will give the nod to Luis Castillo (0-3, 6.29 ERA), who is eyeing win No. 1 on the season, and the White Sox will turn to Anthony Kay (1-1, 5.70 ERA). When Castillo starts, his team is 1-6-0 against the spread this season. Castillo’s team has a record of 1-5 this season when he starts and they are the favorite on the moneyline. When Kay starts, the White Sox are 2-2-0 against the spread. The White Sox are 1-3 in Kay’s four starts this season that they were the underdog on the moneyline.

Prediction: Mariners win (65.8%)

The Mariners have won in 18, or 51.4%, of the 35 contests they have been named as odds-on favorites in this year. Seattle has a record of 11-8 when favored by -138 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 have posted a record of 14-25-0 against the spread this season.

The White Sox have gone 14-18 in games they were listed as the moneyline underdog (winning 43.8% of those games). In games it has played as a moneyline underdog with odds of +118 or longer, Chicago has a 12-14 record (winning 46.2% of its games). The White Sox have played in 36 games with a set over/under, and have combined with their opponents to go over the total 19 times (19-17-0). The White Sox have a 19-17-0 record ATS this season.