MLB Prop Bets: Chicago White Sox vs Seattle Mariners (May 9, 2026)
The Seattle Mariners (19-20) face the Chicago White Sox (17-21) at Rate Field on Saturday at 7:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Luis Castillo is the probable pitcher for the Mariners, while Anthony Kay is the probable pitcher for the White Sox. The Mariners are favored to win at -143, while the White Sox are at +119. The total runs line is set at 9.0, with OVER at -105 and UNDER at -115.
- The Mariners (+113) have a 16-23 Run Line record this season, while the White Sox (-136) hold a record of 18-20.
- The Mariners have an 18-20-1 O/U record this season (meaning 18 games have gone over the total runs line, 20 have gone under and one has resulted in a push). The White Sox have a 21-17-0 O/U record.
Scoring Insights
- The Mariners are averaging 4.2 runs per game this season (20th in the league). Comparatively, the White Sox are averaging 4.3 (T18th).
- In the field, the Mariners are allowing 4.0 runs per game this season (7th in the league), while the White Sox are allowing an average of 4.8 runs (22nd).
Let's take a look at how these teams perform in some other key statistical areas.
Batting Insights:
Batting Average
- Looking at their batting averages this season, the Mariners are at .232 (ranking 24th in the Major leagues), while the White Sox are batting .230 (27th).
Home Runs
- In terms of total home runs this season, the White Sox have hit 47 (T7th in the Major Leagues). Meanwhile, the Mariners have managed 46 (9th).
Runs Batted In
- Finally, looking at their runs batted in, the Mariners have recorded 160 RBIs to rank T15th in the MLB this season. Comparatively, the White Sox have recorded 153 RBIs to rank T22nd.
Pitching Insights:
Earned Run Average
- The White Sox have an earned run average of 4.44 this season (21st in the Majors), while The Mariners have an ERA of 3.75 (7th).
Strikeouts
- Turning our attention to total strikeouts, the Mariners have recorded 325 this season, ranking T16th in the MLB. Meanwhile, the White Sox rank 22nd for total strikeouts, recording 301.
Opponent Batting Average
- Opponents are batting an average of .244 against the White Sox this season (17th in the Major Leagues). Comparatively, the Mariners' opponents are at .255 (24th).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 9-11-19 | 8-8-7 | 1-3-12 | 9-10-15 | 0-1-4 | 0-0-0 | 1-3-6 |
| White Sox | 11-6-21 | 4-2-10 | 7-4-11 | 0-1-5 | 11-5-16 | 0-0-0 | 2-1-7 |
Lead After Three Innings
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 15-14-10 | 11-8-4 | 4-6-6 | 12-13-9 | 3-1-1 | 0-0-0 | 4-3-3 |
| White Sox | 17-11-10 | 7-4-5 | 10-7-5 | 0-3-3 | 17-8-7 | 0-0-0 | 5-2-3 |
NRFI/YRFI
The NRFI market is paying +100 and the YRFI is paying -130.
- The NRFI is 16-23 in Mariners games this season. The White Sox have a 20-18 NRFI record.
Last Time They Met
The Mariners recorded a 12-8 victory over the White Sox at Rate Field yesterday. Luke Raley was crushing the ball in that matchup, hitting 2 home runs and recording 7 RBIs. The Mariners have now won five straight against the White Sox.
