Mariners Call Up Kade Anderson for Saturday Start Against Cubs

Left-hander Kade Anderson, the top pitching prospect in baseball, will debut Saturday against the Chicago Cubs following a 10-1 record at Double-A Arkansas.

The Seattle Mariners are promoting 22-year-old left-hander Kade Anderson to start against the Chicago Cubs this Saturday. Anderson, the consensus top pitching prospect in baseball, arrives from Double-A Arkansas where he posted a 10-1 record and a 1.06 ERA across 18 starts. During his 93⅓ innings with the Travelers, he recorded 135 strikeouts while issuing only 13 walks. He surrendered just 47 hits and 11 total runs during his tenure in the Texas League this season, resulting in his status as a near-lock for minor league player of the year.

Seattle currently holds a 60-68 record and sits in fifth place in the American League for rotation ERA at 3.83, trailing New York, Detroit, Tampa Bay, and Cleveland. To make room for the rookie southpaw, right-hander Bryan Woo will have his scheduled start pushed back. Anderson has been exceptionally dominant recently, holding opponents scoreless in 13 of his 18 professional starts. Excluding a May 15 outing against Northwest Arkansas where he allowed five runs in four innings, his ERA for the remainder of the season sits at 0.60.

Scouting the Top Prospect

Anderson utilizes a repertoire featuring a mid-90s fastball, two distinct breaking balls, and an elite changeup. While evaluators noted his fastball was less potent during spring training while using the major league ball, his off-speed offerings are considered high-level enough to mitigate those concerns. His professional debut followed a decorated collegiate career at LSU, where he helped the Tigers secure a College World Series championship. As a sophomore in 2025, he struck out 180 batters and walked 35 over 119 innings of work.

During his freshman year in 2024, Anderson functioned in a hybrid role, splitting time between the starting rotation and the bullpen. He eventually transitioned into a full-time starter, leading to his selection as the third overall pick in the 2025 MLB Draft. Seattle acquired the pick after winning the draft lottery to jump from the 15th-best odds into the top three. The Mariners signed him for an $8.8 million bonus, the second-largest sum in that draft class, trailing only the $9 million earned by Colorado shortstop Ethan Holliday.

Context of the Seattle Rotation

The Mariners are attempting to salvage postseason hopes after a disappointing follow-up to their 2025 campaign. Last season, the club held a 3-2 lead over Toronto in the American League Championship Series before losing two consecutive games to miss the World Series. Ineffectiveness and various injuries have hampered the current rotation, which has underperformed relative to previous years. Anderson’s promotion follows his appearance in the All-Star Futures Game, where he served as the American League starter and threw one scoreless inning.

The left-hander’s arrival comes as the team looks for stability after Washington and the Los Angeles Angels passed on him to sign under-slot deals with the first two picks of the 2025 draft. Anderson has allowed nearly half of his season's total runs in a single four-inning appearance, demonstrating high-level consistency across his other 17 starts. He officially debuted in the minor leagues in April and moved rapidly through the system to reach the active roster by late August.