Oakland A's pitching prospect Gage Jump made his Triple-A debut with the Sacramento River Cats on Tuesday, facing the Oklahoma City Comets. The outing provided insights into his development and potential big-league timeline.

Jump's Triple-A Debut: Focus on Fastball

Jump pitched 2 1/3 innings, allowing two hits, one earned run, two walks, and recording four strikeouts. He began by hitting the first batter, Hyeseong Kim, followed by a double that scored Kim. Despite a rocky start, Jump quickly settled in.

Pitching Arsenal & Strategy

Jump primarily utilized his fastball and slider, averaging 84.2 mph on the slider, which increased to 85.6 mph by the third inning. He threw only two changeups and two curveballs, focusing on locating his fastball and getting ahead of hitters. Six of his ten first pitches were strikes.

The A's appear to be managing Jump’s innings, similar to last season, potentially conserving his arm for later in the year. His limited pitch selection suggests a focused effort on refining his fastball command.

Zack Gelof's Resurgence in Triple-A

Former A's second baseman Zack Gelof is showcasing a potential bounceback season in Triple-A. On Tuesday night, he played center field, going 3-for-5 with a home run, three RBI, and a run scored.

Improved Plate Discipline

Gelof is currently 6-for-14 with a .619 on-base percentage and two home runs. Impressively, he has drawn seven walks in four games while striking out only twice. This represents a significant improvement from his struggles in 2024 and 2025.

Gelof’s strikeout rate has dramatically decreased to 9.5% in Triple-A, compared to 34.4% in 2024 and 45.5% in the big leagues in 2025. This improved plate discipline is a key indicator of his potential resurgence.

While it’s early in the season, Gelof’s performance is a positive sign for both the player and the A's organization.

Jason, a long-time A's beat writer and former host of the Locked on A’s podcast, contributed to this report.