WEST SACRAMENTO -- Left-hander Gage Jump, who has quickly developed into one of the most exciting pitching prospects in the Athletics system in quite some time, is set to make his Major League debut.
The A’s have called up Jump and are handing him Tuesday night’s start against the Mariners at Sutter Health Park. Jump, a 23-year-old lefty, ranks as the A’s No. 3 prospect and No. 41 overall prospect in baseball, per MLB Pipeline. Right-hander Aaron Civale was placed on the 15-day injured list with right shoulder tendinitis and outfielder Denzel Clarke was transferred to the 60-day IL in corresponding moves.
Jump’s promotion comes on the heels of earning Pacific Coast League Pitcher of the Week honors following a stellar outing for Triple-A Las Vegas in which he tossed seven scoreless innings with no walks and nine strikeouts. That game caught the attention of A’s manager Mark Kotsay, who makes it a point to frequently check in on the performance of the club’s top prospects.
“Step in the right direction for Gage,” Kotsay said last week. “The aggression in the zone with his fastball was solid. The use of the changeup finally came out, which has been an emphasis. That’s the type of performance we’re looking for from Gage that he needs for his confidence and for us to really get an understanding of what he’s capable of doing.”
Drafted as a Competitive Balance Round B selection (No. 73 overall) in 2024 out of LSU, Jump is part of an A’s Draft class that has already seen Nick Kurtz rise to stardom as the reigning American League Rookie of the Year, while fellow A’s top prospects Tommy White (No. 9) and Joshua Kuroda-Grauer (No. 10) are both already knocking on the door of the big leagues at Triple-A.
COMPLETE ATHLETICS PROSPECT COVERAGE
Jump made his professional debut in 2025, and by the end of the year, there was no denying his merit as one of baseball’s Top 100 prospects. His routine dominance of hitters at High-A Lansing to start out the season earned him a promotion to Double-A Midland after just six games (five starts). Between the two levels, Jump went 9-7 with a combined 3.28 ERA in 26 games (24 starts) with 131 strikeouts and 34 walks over 112 2/3 innings.
In nine starts at Triple-A Las Vegas this season, Jump is 0-2 with a 4.50 ERA, but he struck out 56 in 38 innings along with 20 walks and 36 hits allowed.
Jump likely would have come up sooner had he not gotten off to such a slow start to his season in the Minors. Now, he’ll get a shot to provide a boost for this first-place A’s squad with his electric arsenal, which includes a fastball that can touch 99 mph along with secondary pitches in his slider, changeup and curveball.