The Seattle Mariners head to Sutter Health Park on Friday, September 11, 2026, for a 9:40 PM ET matchup against the Athletics. George Kirby gets the ball for Seattle against Athletics left-hander Jeffrey Springs in what shapes up as an intriguing pitching duel. With the regular season winding into its final weeks, every game carries weight, and this road contest gives the Mariners a chance to pick up a critical win away from T-Mobile Park. Catch the action on Mariners.TV or tune in on Seattle Sports 710 AM.

Mariners at Athletics Pitching Matchup: George Kirby vs. Jeffrey Springs

George Kirby takes the mound for Seattle. Kirby has built a reputation as one of the more reliable arms in the Mariners rotation, a pitcher whose elite command and ability to generate contact on his terms makes him a handful for any lineup. He will need to be sharp against an Athletics offense that, while not loaded with household names, has enough professional hitters to punish mistake pitches.

Jeffrey Springs gets the start for Oakland. Springs is a left-handed pitcher with a varied arsenal capable of neutralizing right-handed bats. The Mariners will need to be patient at the plate and stay disciplined, particularly early in the game when Springs tends to operate with his best stuff.

Athletics Starting Lineup to Watch

Oakland manager has constructed a lineup worth respecting. Lawrence Butler hits cleanup in right field and represents the most dangerous bat in the order — a young player with legitimate power who can change the complexion of a game in a single at-bat. Zack Gelof hits third at third base and adds another middle-of-the-order threat. Henry Bolte leads off from center field, giving Oakland a speedy presence at the top, while Jeff McNeil slots in second at second base, bringing a contact-oriented approach that can frustrate pitchers looking for easy outs.

Jonah Heim catches for Oakland and hits ninth, but catchers who hit at the bottom of a lineup can be deceptively dangerous as lineup-turners. Max Muncy at DH and Tommy White at first base give the A's additional pop. Kirby will need to command all four quadrants of the strike zone to keep this group honest.

Keys to the Game for Seattle

• Kirby's command: If Kirby locates his fastball and keeps his secondary pitches sharp, the Athletics lineup has limited answers. Any lapse in command, however, and Oakland's middle of the order will make him pay.
• Patience against Springs: Springs can be susceptible when hitters work deep counts and force him out of his comfort zone. Seattle's lineup needs to grind at-bats and avoid early-count weak contact.
• Neutralizing Lawrence Butler: Butler in the four-hole is Oakland's most dangerous weapon. How Kirby and the Mariners pitching staff handle him will go a long way toward determining the outcome.
• Road focus: Sutter Health Park is not T-Mobile Park. The Mariners need to bring the same energy on the road that they show at home.

Prediction

This game comes down to pitching, and right now George Kirby gives Seattle the edge. If he delivers a quality start and the Mariners offense does enough damage against Springs early, Seattle takes this one. Look for a low-scoring game decided by three runs or fewer. Mariners win, 3-1.