MLB Prop Bets: Seattle Mariners vs San Francisco Giants (July 18, 2026)
The San Francisco Giants (42-55) face the Seattle Mariners (48-50) at T-Mobile Park on Saturday at 8:08pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Logan Webb is the probable pitcher for the Giants, while Bryan Woo is the probable pitcher for the Mariners. The Mariners are favored to win at -135, while the Giants are at +112. The total runs line is set at 6.5, with OVER at -124 and UNDER at +103.
- The Giants (-207) have a 47-50 Run Line record this season, while the Mariners (+169) hold a record of 41-57.
- The Giants have a 44-44-9 O/U record this season (meaning 44 games have gone over the total runs line, 44 have gone under and nine have resulted in a push). The Mariners have a 47-45-6 O/U record.
Scoring Insights
- The Giants are averaging 4.1 runs per game this season (24th in the league). Comparatively, the Mariners are averaging 4.0 (28th).
- In the field, the Giants are allowing 4.7 runs per game this season (19th in the league), while the Mariners are allowing an average of 3.9 runs (6th).
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 Giants are at an impressive .256 (ranking 4th in the Major leagues), while the Mariners are batting an underwhelming .228 (29th).
Home Runs
- In terms of total home runs this season, the Mariners have hit 115 (T14th in the Major Leagues). Meanwhile, the Giants have managed 108 (T20th).
Runs Batted In
- Finally, looking at their runs batted in, the Giants have recorded 387 RBIs to rank 22nd in the MLB this season. Comparatively, the Mariners have recorded 378 RBIs to rank 28th.
Pitching Insights:
Earned Run Average
- The Mariners have an earned run average of 3.64 this season (7th in the Majors), while The Giants have an ERA of 4.42 (22nd).
Strikeouts
- Turning our attention to total strikeouts, the Giants have recorded 736 this season, ranking 27th in the MLB. Meanwhile, the Mariners rank 11th for total strikeouts, recording 834.
Opponent Batting Average
- Opponents are batting an average of .241 against the Mariners this season (15th in the Major Leagues). Comparatively, the Giants' opponents are at .247 (20th).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Giants | 20-25-52 | 10-7-30 | 10-18-22 | 7-6-22 | 13-19-30 | 0-0-0 | 3-3-4 |
| Mariners | 22-20-56 | 13-11-24 | 9-9-32 | 21-17-44 | 1-3-12 | 0-0-0 | 0-0-10 |
Lead After Three Innings
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Giants | 29-42-26 | 13-20-14 | 16-22-12 | 10-14-11 | 19-28-15 | 0-0-0 | 4-5-1 |
| Mariners | 40-34-24 | 22-14-12 | 18-20-12 | 32-28-22 | 8-6-2 | 0-0-0 | 3-6-1 |
NRFI/YRFI
The NRFI market is paying -155 and the YRFI is paying +120.
- The NRFI is 51-46 in Giants games this season. The Mariners have a 51-47 NRFI record.
Last Time They Met
The Giants recorded an upset 7-0 victory over the Mariners at T-Mobile Park yesterday. Willy Adames went yard en route to that victory, hitting a home run to go with 4 RBIs. The Giants have now won four straight against the Mariners.
