Arizona Diamondbacks vs Seattle Mariners Prediction 5/31/2026 Today’s MLB Picks

In this article, we will formulate a Diamondbacks vs Mariners Prediction for this MLB matchup on Sunday, May 31st in the third game of this series. Let’s take a look at the prediction for this MLB matchup.

Seattle Mariners Preview

The Seattle Mariners have a 30-29 record this season and are sitting in the 1st place of the AL West. They have a 16-15 home record and are coming off a 5-1 home win against the Diamondbacks. They will face the Mets and the Tigers next.

The Mariners have a .233 batting average this season, .317 OBP and .395 Slugging percentage. Seattle’s pitching staff has a 3.51 ERA and 1.21 WHIP. Randy Arozarena is the team’s best hitter with a .292 batting average. Luke Raley leads the team in RBI with 31, adding a team-high 13 home runs.

Bryce Miller (R) is the projected starting pitcher for the Mariners, and he has a 1-0 record, 2.25 ERA and 1.00 WHIP.

Arizona Diamondbacks Preview

The Arizona Diamondbacks have a 31-26 record this season and are sitting in the 3rd place of the NL West. They have a 13-16 road record and are coming off a 1-5 road defeat against the Mariners. They will face the Dodgers and the Nationals next.

The Diamondbacks have a .247 batting average this season, .312 OBP and .399 Slugging percentage. Arizona’s pitching staff has a 4.06 ERA and 1.24 WHIP. Ildemaro Vargas is the team’s best hitter with a .296 batting average, also leading the team in RBI with 37. Ketel Marte adds a team-high 9 home runs.

Merrill Kelly (R) is the projected starting pitcher for the Diamondbacks, and he has a 5-3 record, 5.25 ERA and 1.42 WHIP.

Arizona Diamondbacks @ Seattle Mariners Betting Trends: May 31, 2026

• Probable Starting Pitcher: Bryce Miller      Record this season: 1-0      ERA: 2.25
• Home Record: 0-0
• Last 5 against Diamondbacks: –

Why the Seattle Mariners will win

• The home team has won seven of the last eight games between the Diamondbacks and Mariners.
• The Diamondbacks have lost each of their last five day games against teams that held a winning record.
• The Mariners have covered the run line in each of their last five day games at T-Mobile Park following a win.
• The Diamondbacks have failed to cover the run line in four of their last five games against American League opponents after playing the previous day.
• The Mariners have led after 3 innings in each of their last six games.
• The Mariners have won the first inning in each of their last three day games against the Diamondbacks.
• The Diamondbacks have trailed after 5 innings in each of their last six day games against opponents that held a winning record.

• Probable Starting Pitcher: Merrill Kelly      Record this season: 5-3      ERA: 5.25
• Road Record: 3-2
• Last 5 against Mariners: 0-1

Why the Arizona Diamondbacks will win

• The Diamondbacks have won each of their last seven Sunday games as road underdogs against American League opponents.
• The Mariners have lost seven of their last nine games as favorites against NL West opponents.
• The Mariners have failed to cover the run line in nine of their last 10 home games against NL West opponents that held a winning record.
• The Diamondbacks have covered the run line in each of their last seven Sunday games as road underdogs against American League opponents.
• The Mariners have trailed after 3 innings in five of their last six day games against National League opponents.
• The Diamondbacks have led after 5 innings in seven of their last eight games against American League opponents that held a winning record.

Total Runs Facts

• Six of the Diamondbacks’ last seven games as underdogs against the Mariners have gone UNDER the total runs line.
• Six of the Mariners’ last seven day games as favorites have gone OVER the total runs line.
• The ‘Inning 1 UNDER 0.5 runs’ market has hit in 12 of Bryce Miller’s last 15 home appearances as a starter.
• The ‘Inning 1 OVER 0.5 runs’ market has hit in eight of the Diamondbacks’ last 10 games against American League opponents.

Seattle Mariners Player Prop Facts

• Julio Rodriguez has hit a home run in four of the Mariners’ last five games as favorites.
• Bryce Miller has recorded a win in four of his last five appearances with the Mariners as favorites against NL opponents.
• Julio Rodriguez has recorded two or more hits in each of the Mariners’ last five games against the Diamondbacks.
• Randy Arozarena ranks 5th in the league in Steals (15) this season.

Arizona Diamondbacks Player Prop Facts

• Merrill Kelly has recorded a win in each of his last four appearances.
• Merrill Kelly has recorded five or more strikeouts in each of his nine previous appearances with his team as an underdog against AL West opponents.
• Corbin Carroll has recorded at least one hit in each of his last 12 appearances in day games against AL teams that held a winning record.
• James McCann has hit a home run in two of his last three road appearances against AL opponents.

Matchup/League Facts

• The Mariners rank 1st in the league for walks allowed this season (152).
• The Mariners are one of only three teams in the league to rank top 10 in both steals and home runs this season.
• The Diamondbacks rank 1st in the league for triples this season (17).
• The Diamondbacks rank 30th in the league for strikeouts this season (404).

Diamondbacks vs Mariners Prediction

The Diamondbacks are 4-2 in their last 6 meetings against the Mariners but are 1-4 in their last 5 visits in Seattle.

In this Diamondbacks vs Mariners Prediction, the Mariners are coming as -150 home favorites. The Mariners have been red-hot with five consecutive wins and have the pitching edge with Bryce Miller on the mound, who has been looking terrific so far. They also have the 4th-best bullpen in baseball and have been far better against righties, ranking 6th against right-handed pitching in the past 10 days. Take the Mariners to win this one at home.

Nikos Lagouretos's Pick: Seattle Mariners ML