MLB Prop Bets: Seattle Mariners vs Arizona Diamondbacks (May 29, 2026)
The Arizona Diamondbacks (31-24) face the Seattle Mariners (28-29) at T-Mobile Park on Friday at 10:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Zac Gallen is the probable pitcher for the Diamondbacks, while George Kirby is the probable pitcher for the Mariners. The Mariners are favored to win at -149, while the Diamondbacks are at +123. The total runs line is set at 7.0, with OVER at -112 and UNDER at -107.
- The Diamondbacks (-175) have a 33-22 Run Line record this season, while the Mariners (+144) hold a record of 24-33.
- The Diamondbacks have a 25-24-6 O/U record this season (meaning 25 games have gone over the total runs line, 24 have gone under and six have resulted in a push). The Mariners have a 26-29-2 O/U record.
Scoring Insights
- The Diamondbacks are averaging 4.6 runs per game this season (10th in the league). Comparatively, the Mariners are averaging 4.2 (18th).
- In the field, the Diamondbacks are allowing 4.4 runs per game this season (15th in the league), while the Mariners are allowing an average of 3.8 runs (5th).
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 Diamondbacks are at .248 (ranking 5th in the Major leagues), while the Mariners are batting .230 (23rd).
Home Runs
- In terms of total home runs this season, the Mariners have hit 66 (T9th in the Major Leagues). Meanwhile, the Diamondbacks have managed 48 (26th).
Runs Batted In
- Finally, looking at their runs batted in, the Diamondbacks have recorded 246 RBIs to rank 10th in the MLB this season. Comparatively, the Mariners have recorded 234 RBIs to rank 13th.
Pitching Insights:
Earned Run Average
- The Mariners have an earned run average of 3.54 this season (5th in the Majors), while The Diamondbacks have an ERA of 4.02 (15th).
Strikeouts
- Turning our attention to total strikeouts, the Diamondbacks have recorded 392 this season, ranking 30th in the MLB. Meanwhile, the Mariners rank 10th for total strikeouts, recording 485.
Opponent Batting Average
- Opponents are batting an average of .247 against the Mariners this season (22nd in the Major Leagues). Comparatively, the Diamondbacks' opponents are at .238 (15th).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Diamondbacks | 13-14-28 | 7-5-14 | 6-9-12 | 7-3-13 | 6-11-15 | 0-0-2 | 3-1-6 |
| Mariners | 16-14-27 | 10-9-10 | 6-5-17 | 16-13-22 | 0-1-5 | 0-0-0 | 4-2-4 |
Lead After Three Innings
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Diamondbacks | 23-22-10 | 13-6-7 | 9-15-3 | 14-4-5 | 9-18-5 | 1-1-0 | 7-2-1 |
| Mariners | 25-18-14 | 13-10-6 | 12-8-8 | 21-17-13 | 4-1-1 | 0-0-0 | 6-2-2 |
NRFI/YRFI
- The NRFI is 24-31 in Diamondbacks games this season. The Mariners have a 24-33 NRFI record.
Last Time They Met
The Diamondbacks recorded a 5-2 victory over the Mariners at Chase Field when these teams last met on June 11, 2025. Eugenio Suarez dominated at the plate in that matchup, notching 1 home run, 2 singles and 4 RBIs. The Diamondbacks have now won four straight against the Mariners.
