What happened: The Athletics are calling up left-handed pitching prospect Gage Jump, sources told ESPN's Jeff Passan. Jump, 23, has struck out 56 batters over 38 innings at Triple-A and runs his fastball up to 97 mph. He entered pro ball as part of the 2024 draft class.

Why it matters: Jump is regarded as one of the best left-handed pitching prospects in baseball, and his promotion gives a 6-9 Athletics club a high-upside arm as it tries to climb out of a sub-.500 hole. A power lefty with swing-and-miss stuff can immediately reshape the back of the rotation or leverage innings, and his debut becomes a fantasy and prop talking point given the strikeout profile.

What to watch: Watch for the Athletics to confirm a corresponding roster move and announce when Jump will make his first appearance. His debut assignment — rotation start versus bullpen leverage — will set early expectations.