The A’s are calling up left-hander Gage Jump, reports Jeff Passan of ESPN. The 23-year-old is among the top prospects in the organization. When he first appears in a game, it will be his MLB debut. The team has yet to announce the move.
MLB Pipeline ranks Jump at No. 3 in the Athletics system. FanGraphs‘ Eric Longenhagen has him only behind shortstop Leo De Vries. Jump has a mid-4.00s ERA at Triple-A this season, but he’s delivered a hefty 33.1% strikeout rate. He allowed just two earned runs over 9 2/3 innings in MLB Spring Training this spring.
The A’s took Jump with the 73rd overall pick in the 2024 draft out of LSU. He immediately provided workhorse-level production in his first taste of pro ball, tossing 112 2/3 innings last year. Jump posted a 3.28 ERA and a sub-3.00 FIP between High-A and Double-A. He didn’t crack MLB Pipeline’s top 100 prospects in 2025, but sits at No. 41 in this season’s rankings.
Jump has shown a diverse pitch mix this year with Las Vegas. He’s leaned on the four-seamer more than half the time, but also thrown plenty of sliders and curveballs. Jump has also thrown both a sweeper and a changeup more than 5% of the time. Control has been a bit of an issue, as Jump’s 11.8% walk rate is a significant increase from his 2025 mark.
