Arizona Diamondbacks vs Seattle Mariners Picks and Predictions June 9th 2025

Arizona Diamondbacks vs Seattle Mariners June 9th 2025

The Seattle Mariners will take on the Arizona Diamondbacks at Chase Field on Monday, June 9, 2025. The game is set to start at 9:40 PM, and fans can catch the action on ARID. The weather in Phoenix is expected to be very hot with clear skies, but the retractable roof may keep conditions comfortable inside the stadium.

The Mariners, managed by Dan Wilson, have a season record of 33-31 and are 2 games behind in the AL West. They have a road record of 17-14. The Diamondbacks, led by Torey Lovullo, hold a record of 31-34 and are 7 games back in the NL West. Their home record stands at 15-17. Emerson Hancock will pitch for the Mariners, while Merrill Kelly will start for the Diamondbacks.

Mariners vs Diamondbacks Key Information

• Sport: Baseball
• Teams: Seattle Mariners vs. Arizona Diamondbacks
• Venue: Chase Field in Phoenix, AZ
• Date: Monday, June 9, 2025
• Betting Odds: Mariners MoneyLine +140, Diamondbacks MoneyLine -166

The Mariners Can Win If…

The Seattle Mariners are coming off a win against the Los Angeles Angels, where they took the game 3-2. George Kirby was dominant on the mound, pitching seven innings with 14 strikeouts. Randy Arozarena stood out with three hits, including two doubles, contributing to the Mariners’ offense.

The Mariners have shown strength in hitting home runs, ranking 6th in the league with 81 home runs this season. Their on-base percentage is ranked 11th, showing that they have been effective at getting on base. Cal Raleigh leads the team with 24 home runs, making him a key player to watch in the lineup.

Emerson Hancock will start for the Mariners, and he has a chance to improve his record. The Mariners have a solid track record of quality starts, ranking 9th in this category. With strong performances from their hitters and a capable starting pitcher, the Mariners have a good chance to win their next game against the Arizona Diamondbacks.

The Diamondbacks Can Win If…

The Arizona Diamondbacks are looking to bounce back after a 4-2 loss to the Cincinnati Reds. Zac Gallen pitched 6 2/3 innings, giving up four runs and striking out five. Eugenio Suárez and Corbin Carroll contributed with a home run and an RBI single, respectively.

Arizona’s hitting stats show they have the ability to win games. They rank 3rd in slugging percentage at .448 and 4th in home runs with 87. Their batting average of .255 ranks 5th, showing they can make contact and get on base.

With Merrill Kelly on the mound, the Diamondbacks have a strong chance. Kelly holds an ERA of 3.43 and a WHIP of 0.99, with a 6-2 record. His ability to limit hits and walks could be key against the Mariners.

The Lean

The Diamondbacks are favored with a MoneyLine of -166. They have a strong batting lineup, ranking 5th in batting average and 3rd in slugging percentage. The Mariners have a MoneyLine of +140 and rank lower in these areas. Based on these stats, the model projects the Diamondbacks to win with a score of 6-4.

The over/under line is set at 9.5. The Diamondbacks’ earned run average is 4.75, ranking 24th, which might allow more runs. The Mariners’ pitching is slightly better with an ERA of 3.87. Given the projected score of 6-4, the model suggests taking the over on the total. This aligns with the teams’ hitting strengths and pitching weaknesses.

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Recent Slumps

The Arizona Diamondbacks enter Monday’s opener in Phoenix having dropped 12 of their last 17 games, while the Seattle Mariners have lost 11 of 17. Arizona’s roller-coaster 3–3 road trip featured a seven-run ninth-inning rally to sweep Atlanta, followed by being swept in three games at Cincinnati. Seattle was swept at home by Baltimore before losing two of three to the Angels. Both clubs desperately need a spark as they settle in for a pivotal opening game. For a broader look at today’s matchups, check out our full collection of MLB previews.

Pitching Matchup

Diamondbacks right-hander Merrill Kelly (6–2, 3.43 ERA) has been dominant lately, going 5–1 with a 2.55 ERA over his last 11 starts. He’ll face Mariners righty Emerson Hancock (2–2, 5.19), who’s pitched to a 2.91 ERA in his past four outings but could be fighting for his rotation spot once Logan Gilbert returns. Kelly’s last outing featured seven shutout innings against Atlanta. Hancock owns one career win over Arizona, allowing one run in six frames in 2024.

Hot Hitters

Two of baseball’s hottest bats square off in this series opener. Mariners catcher Cal Raleigh leads all catchers with 26 homers, pacing toward Salvador Perez’s single-season record of 48. Diamondbacks second baseman Ketel Marte has reached base in 21 straight games and is hitting .343 with seven homers, 13 RBIs and 13 walks in his past 18 contests.

Injury Updates

Arizona lost ace Corbin Burnes for the season to Tommy John surgery, a blow to their rotation depth. Catcher Gabriel Moreno missed the final two games in Cincinnati after taking a wild pitch off his right hand but is expected back for Monday. Seattle’s star center fielder Julio Rodríguez exited Saturday’s game with an ankle contusion after a liner strike but returned Sunday and should be in the lineup.

For expert analysis and recommended wagers on this series, explore our MLB picks and consult the expert betting guide. If you’re looking to secure professional insights, visit our buy picks page. To see which handicappers are backing which side, browse the handicappers leaderboard.