Seattle Mariners vs Arizona Diamondbacks Prediction 5/31/26 MLB Picks Today

The Arizona Diamondbacks and the Seattle Mariners meet Sunday in MLB action from T-Mobile Park. We will look at this from a betting perspective and determine the best bets for this game. Here’s an Arizona Diamondbacks vs. Seattle Mariners prediction.

Starting Pitching Matchup

The Arizona Diamondbacks will send out Merrill Kelly for the start here and Kelly is 5-3 with a 5.25 ERA and 31 strikeouts this season. In his career, Kelly is 0-1 with a 2.70 ERA and 19 strikeouts against the Mariners. Bryce Miller will start for the Mariners and is 1-0 with a 2.25 ERA and 14 strikeouts this season. This will be Miller’s first career start against the Diamondbacks.

Arizona Diamondbacks Recap

The Arizona Diamondbacks come into this game looking to shake off a 5-1 loss at the hands of the Seattle Mariners last time out to sit at 31-26 this season. After this series, the Diamondbacks will ead home for a series against the Los Angeles Dodgers.

Diamondbacks Drop Back-To-Back Games

Entering Saturday, Corbin Carroll has 55 hits including 12 doubles, 8 triples, 7 home runs and 28 RBIs. Ketel Marte has 58 hits with 11 doubles, 9 home runs and 32 RBIs and Geraldo Perdomo has 40 hits, with 8 doubles, 3 triples, 2 home runs and 20 RBIs as well this season. Nolan Arenado also has 46 hits with 11 doubles, 7 home runs and 27 RBIs and Jose Fernandez has 37 hits with 3 home runs and 14 RBIs this season. Ildemaro Vargas also has 57 hits with 9 doubles, 2 triples, 7 home runs and 35 RBIs.

Seattle Mariners Recap

The Seattle Mariners come into this game looking to add on to their win over the Diamondbacks from Friday to improve to 30-29 on the year. After this series, the Mariners will take on the New York Mets at home.

Mariners Win 5 Straight

Going into Saturday, Luke Raley has 11 home runs and 29 RBIs this season. Cole Young’s added 48 hits with 10 doubles, a triple, 3 home runs and 27 RBIs and Cal Raleigh has 26 hits with 4 doubles, 7 home runs and 18 RBIs as well this season. Randy Arozarena has 61 hits with 15 doubles, 6 home runs and 25 RBIs as well on the year. Josh Naylor also has 54 hits with 5 home runs and 24 RBIs as well on the year. Julio Rodriguez has also added 59 hits with 11 doubles, 10 home runs and 27 RBIs.

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 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.
• The Mariners have led after 3 innings in each of their last six games.

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

Arizona Diamondbacks Player Prop Facts

• 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.
• Merrill Kelly has recorded a win in each of his last four appearances.

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).

Arizona Diamondbacks vs. Seattle Mariners Prediction

I’m backing Arizona in this one. A decent start to the year is not going to convince me that Bryce Miller is a changed starter all of a sudden, as Miller had ERAs under six both home and away last season. The Diamondbacks have had some issues in this series, but they’ve still been hot over the last couple of weeks and Merrill Kelly’s in some solid form after a rough start to the year. I’ll back Arizona to pick up the win and avoid the sweep.