SEATTLE (AP) — Well before Kade Anderson threw his first MLB pitch, the Seattle Mariners’ prized left-hander took some time to make a few fans’ days.
The 22-year-old Anderson got done with his warmup routine on Saturday quicker than usual before his much-ballyhooed big league debut against the Chicago Cubs. So, rather than ignore the young fans who watched his bullpen session, Anderson did a little something out of the ordinary and scribbled his signature a handful of times before the Mariners beat the Cubs 5-4 in walk-off fashion.
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Seattle Mariners starting pitcher Kade Anderson throws against the Chicago Cubs in his major league debut during the first inning of a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
Seattle Mariners starting pitcher Kade Anderson tips his cap to left fielder Randy Arozarena after he caught a long fly ball over the wall off the bat of Chicago Cubs' Miguel Amaya during the third inning of a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
Seattle Mariners starting pitcher Kade Anderson is greeted in the dugout after facing the Chicago Cubs in the first inning of his major league debut in a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
Seattle Mariners starting pitcher Kade Anderson throws his first pitch in his major league debut against the Chicago Cubs during the first inning of a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
Seattle Mariners starting pitcher Kade Anderson signs autographs in the bullpen before making his major league debut against the Chicago Cubs in a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
Growing up in Slidell, Louisiana, Anderson didn’t go to many major league games. But, Anderson used to hound LSU baseball players for autographs as a kid, so he was more than willing to lend a few minutes of his time.
“That’s what it’s all about at the end of the day, to go out there and pitch for the fans,” Anderson said. “... You just got to give back to those kids.”
Anderson, the third pick in the 2025 draft out of LSU, became the first player from his draft class to make his major league debut. He looked the part of one of the top pitching prospects in baseball, too, for most of the evening.
Anderson yielded three earned runs in 5 2/3 innings, two on back-to-back solo homers in the sixth, which caused the end to his night after 81 pitches. The southpaw departed to a standing ovation from the 45,681 on hand, a figure which included roughly 20 family members and friends.
It could have been worse for Anderson, too, if not for left fielder Randy Arozarena robbing Miguel Amaya of a solo shot in the third.
“I thought it was way gone,” Anderson said of Arozarena’s heroics. “I’m honestly grateful that ball stayed in the park.”
Pete Crow-Armstrong, who led off the sixth with a double, came inches away from starting that frame with a solo home run, too.
On the whole, Anderson coasted his first two times through Chicago’s lineup. He struck out five Cubs hitters, three of them with a slider that generated six whiffs in the game. Manager Dan Wilson elected to send Anderson back out for the sixth because he thought the young lefty was throwing the ball “extremely well,” and was pleased with how he handled adversity.
“The way he used all of his stuff, you saw everything today,” Wilson said. “He wasn’t afraid to throw anything in any count, and I just thought for a first time out there, he looked very, very comfortable, and that’s a great sign.”
Anderson pitched in plenty of high-leverage games while starring for LSU, too. At the professional level, though, Anderson faced little resistance from opposing hitters before Saturday night.
In 18 starts for Double-A Arkansas this year, Anderson went 10-1 with a 1.06 ERA, striking out 135 batters and walking 13 in 93 1/3 innings.
Anderson’s arrival in Seattle coincided with the club being in need of reinforcements. Following Saturday’s win, the Mariners (62-68) moved three games behind Houston in the AL West and two games back in the race for the final wild-card spot.
Going into his outing, Anderson fully understood the magnitude of his debut, not just on a personal level, but also within the context of what it meant for the reigning AL West champions.
“The team was counting on me for a big game today,” Anderson said. “These games matter, especially when the season is getting shorter and shorter. These games matter. I understood that going in. Obviously, it’s a big day for me, but it’s an even bigger day for this org.”
That didn’t stop Anderson, though, from taking a second to look around T-Mobile Park and take it all in before he became the center of attention.
“I’ve only been to Seattle a couple times, but, this place is really cool,” Anderson said. “The weather here is really nice, so that’s a plus. It’s a really special city. I really like it so far.”
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Seattle Mariners starting pitcher Kade Anderson throws against the Chicago Cubs in his major league debut during the first inning of a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
Seattle Mariners starting pitcher Kade Anderson tips his cap to left fielder Randy Arozarena after he caught a long fly ball over the wall off the bat of Chicago Cubs' Miguel Amaya during the third inning of a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
Seattle Mariners starting pitcher Kade Anderson is greeted in the dugout after facing the Chicago Cubs in the first inning of his major league debut in a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
Seattle Mariners starting pitcher Kade Anderson throws his first pitch in his major league debut against the Chicago Cubs during the first inning of a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
Seattle Mariners starting pitcher Kade Anderson signs autographs in the bullpen before making his major league debut against the Chicago Cubs in a baseball game, Saturday, Aug. 22, 2026, in Seattle. (AP Photo/Lindsey Wasson)
