| MATCHUP | Arizona Diamondbacks | Seattle Mariners |
|---|---|---|
| Team Records | 31-24 | 28-29 |
| Spread | +1.5 -184 | -1.5 151 |
| Moneyline | +119 | -144 |
| Total | Over 7 (-119) | Under 7 (-102) |
| Where | T-Mobile Park, Seattle, Washington | |
| When | Friday, May 29, 2026 | |
| Time | 10:10 PM EDT | |
| TV | MLB.TV | |
In this article, we will formulate a Diamondbacks vs Mariners Prediction for this MLB matchup on Friday, May 29th in the opening game of this series. Let’s take a look at the prediction for this MLB matchup.
Seattle Mariners Preview
The Seattle Mariners have a 28-29 record this season and are sitting in the first place of the AL West. They have a 14-15 home record and are coming off a 9-1 road win against the Athletics. They will face the Mets and the Tigers next.
The Mariners have a .230 batting average this season, .317 OBP and .383 Slugging percentage. Seattle’s pitching staff has a 3.54 ERA and 1.22 WHIP. Randy Arozarena is the team’s best hitter with a .295 batting average. Luke Raley leads the team in RBI with 29, adding a team-high 11 home runs.
George Kirby (R) is the projected starting pitcher for the Mariners, and he has a 5-4 record, 3.54 ERA and 1.21 WHIP.
Arizona Diamondbacks Preview
The Arizona Diamondbacks have a 31-24 record this season and are sitting in the second place of the NL West. They have a 13-14 away record and are coming off a 3-2 road win against the Giants. They will face the Dodgers and the Nationals next.
The Diamondbacks have a .248 batting average this season, .314 OBP and .402 Slugging percentage. Arizona’s pitching staff has a 4.02 ERA and 1.24 WHIP. Ildemaro Vargas is the team’s best hitter with a .303 batting average, also leading the team in RBI with 35. Ketel Marte adds a team-high 9 home runs.
Zac Gallen (R) is the projected starting pitcher for the Diamondbacks, and he has a 3-4 record, 4.80 ERA and 1.44 WHIP.
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 Diamondbacks have lost the first inning in three of their last four night games at T-Mobile Park.
- 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.
- 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.
- 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).
Diamondbacks vs Mariners Prediction
The Diamondbacks have won their last four meetings against the Mariners but have lost two of their last three visits in Seattle.
In this Diamondbacks vs Mariners Prediction, the Mariners are coming as -150 home favorites. The Diamondbacks have been the hottest team in baseball lately with a 9-1 record in their last 10 games, but I don’t trust Zac Gallen on the mound, especially on the road. He has given up at least three runs in four of his last five starts and has been atrocious on the road with a 7.25 road ERA. The Mariners have a superior bullpen and are better against righties, while the Dbacks are weaker, so take the Mariners to win this one at home.