3:05pm: The A’s officially announced their selection of Jump’s contract. Civale has indeed been placed on the 15-day IL, due to right shoulder tendonitis. Outfielder Denzel Clarke has been transferred to the 60-day IL to open a 40-man spot. Clarke has a significant hamstring strain and will be out beyond the All-Star break.

7:08am: 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. The A’s have a full 40-man roster and would need to make an adjustment to add Jump.

MLB Pipeline ranks Jump at No. 3 in the Athletics system. FanGraphs‘ Eric Longenhagen has him behind only 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 year.

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 in 2025. 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 last year, but sits at No. 41 in this season’s rankings.

Jump has shown a diverse pitch mix with Las Vegas. He’s leaned on the four-seamer more than half the time, but also thrown plenty of sliders (18.3%) and curveballs (13.1%). Jump has also used 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.

The workload for Jump had been a bit limited to begin the year. He hadn’t completed five innings with the Aviators through eight appearances. Jump went seven strong innings in his last start, striking out nine without issuing a walk. He could step into a rotation that doesn’t have much stability outside of Luis Severino and Jeffrey Springs. Manager Mark Kotsay mentioned a possible IL stint for Aaron Civale after Monday’s game, which would open up a rotation spot.

Photo courtesy of Rick Scuteri, Imagn Images