Cubs get brutal Mariners surprise with baseball's top pitching prospect

The Chicago Cubs have confirmed that David Peterson will start on Saturday night against the Seattle Mariners, and facing the Cubs will be baseball's top pitching prospect. The Mariners will call-up Kade Anderson and he is scheduled to make his debut against the Cubs.

Anderson is the fifth-best prospect in baseball, according to MLB Pipeline, and was at the center of the decisions the Mariners made at the deadline. Seattle traded Luis Castillo to the Chicago White Sox, and the Cubs were among the teams to express interest in George Kirby and Emerson Hancock. Beyond clearing Castillo's money from their books, the Mariners wanted to make sure there was an opening for Anderson in their rotation.

Anderson was selected No. 3 in the 2025 MLB draft, and made his professional debut this season with the Mariners' Double-A affiliate. He's been electric. Through 18 starts this season, Anderson held an ERA of 1.06 while striking out over 40% of the hitters he faced.

Cubs will get first-hand look at Kade Anderson's MLB debut with Mariners

What makes Anderson fascinating is that while the trend for pitching development has become velocity, his fastball tops off around 97 MPH. His ability to miss bats stems directly from his breaking pitches.

"He has two distinct breaking balls, now focusing more on a high-spin mid-80s slider that flashes plus over his older low-80s downer curve. His mid-80s changeup has good fade and sink to it, and he used it more frequently as a sophomore. All four of the offerings missed a ton of bats during his debut season."

The Cubs' offense has found ways to struggles against the fringiest of prospects during their respective debuts, so the task of facing Anderson certainly isn't ideal.

Anderson is essentially the very thing the Cubs' farm system has lacked in recent years. Cade Horton is probably the closest propsect the Cubs had to Anderson's ceiling, but there is still a notable gap between the two profiles.

The hope, starting with this summer's draft, are in the early stages of developing a pipeline of homegrown pitching. The Cubs took 16 pitchers in the draft last month, and first-round pick Cade Townsend has emerged as the top pitching prospect in the system, replacing Jaxon Wiggins.

Still, Townsend doesn't carry the potential that Anderson has. Saturday is going to be special, and unfortunately, it could be at the Cubs' displeasure.

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