Seattle Mariners vs Arizona Diamondbacks Prediction 5/29/26 MLB Picks Today

The Arizona Diamondbacks and the Seattle Mariners meet Friday 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 Zac Gallen for the start here and Gallen is 3-4 with a 4.80 ERA and 40 strikeouts this season. In his career, Gallen is 0-2 with a 9.00 ERA and 9 strikeouts against Seattle. George Kirby will start for the Mariners here and is 5-4 with a 3.54 ERA and 55 strikeouts this season. This will be Kirby’s second career start against the Diamondbacks.

Arizona Diamondbacks Recap

The Arizona Diamondbacks come into this game looking to add on to their 3-2 win over San Francisco last time out to sit at 31-24 this season. After this series, the Diamondbacks will head home for a series against the Los Angeles Dodgers.

Diamondbacks Win 5 In A Row

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 9-1 win over the Athletics from Wednesday’s series finale to sit at 28-29 this season. After this series, the Mariners will take on the New York Mets at home.

Mariners Win 3 In A Row

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 29, 2026

• Probable Starting Pitcher: George Kirby      Record this season: 5-4      ERA: 3.54
• Home Record: 3-2
• Last 5 against Diamondbacks: 1-0

Why the Seattle Mariners will win

• The Diamondbacks have lost each of their last eight Friday games against AL West opponents.
• The home team has won five of the last six games between the Diamondbacks and Mariners.
• The favorites have covered the run line in four of the last five games between the Diamondbacks and Mariners.
• The Diamondbacks have failed to cover the run line in four of their last five road games following a road win.
• The Mariners have led after 3 innings in each of their last four games.
• The Diamondbacks have trailed after 5 innings in four of their last five road games against AL West opponents.
• The Diamondbacks have lost the first inning in three of their last four night games at T-Mobile Park.

• Probable Starting Pitcher: Zac Gallen      Record this season: 3-4      ERA: 4.80
• Road Record: 0-3
• Last 5 against Mariners: 0-2

Why the Arizona Diamondbacks will win

• The Mariners have lost each of their last seven games as favorites against NL West opponents.
• The Diamondbacks have won four of their last five games as underdogs.
• The Mariners have failed to cover the run line each of their last eight home games against NL West opponents that held a winning record.
• The Diamondbacks have covered the run line in 28 of their last 32 games as underdogs following a road win.
• The Diamondbacks have led after 3 innings in five of their last six games.
• The Mariners have trailed after 5 innings in each of their last five games as favorites against NL West opponents.

Total Runs Facts

• Each of the Diamondbacks’ last five games as underdogs against the Mariners have gone UNDER the total runs line.
• Four of the Mariners’ last five night games against National League opponents have gone UNDER the total runs line.
• The ‘Inning 1 OVER 0.5 runs’ market has hit in seven of the Diamondbacks’ last eight games against American League opponents.
• The ‘Inning 1 UNDER 0.5 runs’ market has hit in seven of the Mariners’ last eight games against NL West opponents.

Seattle Mariners Player Prop Facts

• George Kirby has recorded six or more strikeouts in each of his last five Friday appearances at T-Mobile Park.
• Randy Arozarena has recorded at least one hit in each of the Mariners’ last 10 night games against NL West opponents that held a winning record.
• Patrick Wisdom has hit a home run in each of his last three home appearances against the Diamondbacks.
• Randy Arozarena ranks T5th in the league in Steals (14) this season.

Arizona Diamondbacks Player Prop Facts

• Ildemaro Vargas has hit at least one home run in three of the Diamondbacks’ last five night games against AL opponents that held a losing record.
• Zac Gallen has recorded five or more strikeouts in each of his last nine Friday appearances against teams that held a losing record.
• Ildemaro Vargas has recorded at least one hit in each of his last 15 appearances after not playing the previous day.
• Corbin Carroll ranks 9th amongst qualified players for Slugging Percentage (.553) this season.

Matchup/League Facts

• The Mariners rank 1st in the league for walks allowed this season (147).
• The Mariners are one of only four teams in the league to rank top 10 in both strikeouts and walks allowed 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 (392).

Arizona Diamondbacks vs. Seattle Mariners Prediction

I’m on the over in this one. George Kirby got rocked in his last start at home and the Diamondbacks have been red hot as of late. On the other side, Zac Gallen hasn’t been able to keep runs off of the board for much of the year and I think that the over hits when all is said and done here.