Arizona Diamondbacks vs Seattle Mariners Betting Pick & Prediction for 5/31

MLB game preview

The Arizona Diamondbacks are set to play against the Seattle Mariners at T-Mobile Park. This MLB regular season game will be on Sunday, May 31, 2026, at 4:10 PM. The Diamondbacks, with a record of 31-25, are ranked third in the NL West.

The Mariners hold a 29-29 record and are first in the AL West. Merrill Kelly will pitch for the Diamondbacks, bringing a 5-3 record and a 5.25 ERA. Bryce Miller will start for the Mariners with a 1-0 record and a 2.25 ERA.

Arizona Diamondbacks Team Preview

The Arizona Diamondbacks recently played against the Seattle Mariners, losing by one run with a final score of 7-6. They recorded 13 hits, with one home run from Geraldo Perdomo. Zac Gallen pitched five innings, giving up five earned runs and three home runs.

In a previous game against the San Francisco Giants, the Diamondbacks secured a narrow win with a score of 3-2. They managed six hits but did not hit any home runs. Michael Soroka started for Arizona, pitching six innings and allowing two earned runs.

Another game against the Giants saw the Diamondbacks win 7-5. Arizona hit two home runs in that game, one by Ketel Marte and another by Adrian Del Castillo. Eduardo Rodriguez pitched six innings, giving up two earned runs and striking out six batters.

Diamondbacks vs Mariners Game Day Info

  • Sport: MLB
  • Teams: Arizona Diamondbacks vs. Seattle Mariners
  • Venue: T-Mobile Park in Seattle, WA
  • Date: Sunday, May 31, 2026
  • Betting Odds: Diamondbacks +127, Mariners -152

Seattle Mariners Team Preview

The Seattle Mariners have shown strong form in recent games. They defeated the Arizona Diamondbacks 7-6 on May 29, with J.P. Crawford hitting two home runs. Julio Rodríguez also played well, contributing three hits and two RBIs.

The Mariners’ offense has been productive, with consistent hitting power. Their batting average ranks 15th in the league, and they are 7th in home runs. The team scored 9 runs against the Athletics on May 27, highlighting their ability to score in bunches.

Pitching has been a strength for the Mariners. They have an ERA of 3.57, which ranks 5th in the league. Bryce Miller will start the next game, boasting a 2.25 ERA and a 1.00 WHIP this season.

BTB Betting Pick

The Mariners are favored with a moneyline of -152. They have a stronger pitching staff, ranking 5th in ERA, compared to the Diamondbacks’ 16th. With the Mariners’ advantage in pitching, they are the pick to win the game with a projected score of Mariners 5, Diamondbacks 3.

The total for the game is set at 7.5 runs. The Mariners have a solid pitching record, while the Diamondbacks have struggled a bit more. This suggests a lower-scoring game, making the under 7.5 a reasonable choice. The projected total is 8 runs, but the strength of the Mariners’ pitching could keep the total under.