Mariners call up top pitching prospect Kade Anderson

The Seattle Mariners plan to call up top pitching prospect Kade Anderson and hand the left-hander the ball Saturday against the Chicago Cubs. Anderson will make the jump from Double-A Arkansas to Seattle roughly 13 months after the Mariners selected him third overall in the 2025 MLB Draft out of LSU.

The promotion gives the Mariners another high-upside arm for its rotation as the season enters its stretch run. ESPN’s Jeff Passan broke the news Thursday on X, formerly Twitter, detailing the No. 5 prospect in all of baseball’s dominant minor-league production ahead of his expected MLB debut.

“BREAKING: The Seattle Mariners plan to call up left-hander Kade Anderson, the top pitching prospect in baseball, to start Saturday, sources tell ESPN. Anderson, the third pick in the 2025 draft, has a 1.06 ERA over 93.1 innings with 135 strikeouts, 13 walks and 47 hits allowed.”

The following story is in development and will be updated shortly. 

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