Kade Anderson Shines in MLB Debut as Mariners Rally Past Cubs on Randy Arozarena’s Walk-Off Homer

SEATTLE — The Seattle Mariners gave the ball to their top pitching prospect on national television Saturday night, and Kade Anderson delivered the kind of debut that justifies a No. 3 overall pick. The 22-year-old lefty held the Chicago Cubs to one run through 5 2/3 innings before tiring, and Randy Arozarena capped the game with a two-run walk-off homer in the ninth to give Seattle a 5-4 win at T-Mobile Park.

Anderson, who turned 22 last month, was promoted directly from Double-A Arkansas after posting a 1.06 ERA with 135 strikeouts and just 13 walks in 93 1/3 innings across 18 Texas League starts. His arrival came as the Mariners fight for a playoff spot and the baseball world watched the industry’s highest-ceiling pitching prospect make the leap.

A debut under the lights

Anderson’s first major-league pitch was a 94.7 mph fastball that Cubs star Pete Crow-Armstrong popped up. He retired the first nine batters he faced, mixing a four-pitch arsenal that Cubs manager Craig Counsell described as polished beyond Anderson’s limited professional experience.

“He’s been so dominant in the minor leagues that it’s hard to find those places,” Counsell said. “He looks, to me, like a very polished pitcher. It’s four pitches. There’s a ton of strikes. They are all quality pitches.”

Seiya Suzuki broke up the no-hit bid with a leadoff single into shallow center in the fourth. The Cubs manufactured a run in the fifth, but Anderson responded by inducing a double play from catcher Miguel Amaya to end the threat.

The sixth inning proved to be his limit. Alex Bregman and Michael Busch hit back-to-back home runs on Anderson’s 80th and 81st pitches, ending his night. The crowd of 45,681 gave him a standing ovation as manager Dan Wilson took the ball.

“It was just a blast out there,” Anderson said. “There’s obviously going to be some jitters, but I feel like I controlled them pretty well.”

Arozarena’s heroics

The story of the night, however, belonged to Seattle’s leadoff man. Arozarena homered on the first pitch of the game from Cubs starter David Peterson. In the third inning, he made a leaping catch at the left-field wall to rob Amaya of a home run.

With two outs in the ninth and the Mariners trailing 4-3, Arozarena crushed a slider from Cubs reliever Jacob Webb over the center-field fence for a two-run walk-off homer. Webb had not allowed a run in his previous 24 appearances.

“I’m human,” Webb said. “I just didn’t execute today. To (Arozarena), I was honestly trying to bury it and see if I could get a swing out of it, but just left it up a little bit.”

What this means for the Mariners

Anderson’s debut gives Seattle a potential frontline starter for the stretch run of the playoff race. His ability to throw strikes with all four pitches at such a young age is rare, and the organization views him as a key piece for both the current season and the future.

The Mariners will need to manage his workload carefully — Anderson threw 81 pitches Saturday after a full minor-league season — but his performance suggests he can handle high-leverage situations.

For the Cubs, the loss stung. It marked the second consecutive walk-off defeat in Seattle, following a 10-inning loss Friday night. Counsell indicated Webb will remain the team’s closer despite the blown save.

Source: The Athletic — https://www.nytimes.com/athletic/7532273/2026/08/23/kade-anderson-mariners-mlb-debut/