The Milwaukee Brewers placed left-hander Kyle Harrison on the 15-day injured list Saturday with tightness in his throwing forearm, a move retroactive to Thursday. The announcement came before a doubleheader against the Pittsburgh Pirates, ending a breakthrough campaign for the 24-year-old acquired from the Boston Red Sox in February. Harrison had disclosed elbow soreness following a four-inning outing in Wednesday's 5-1 loss at St. Louis.

Harrison entered the weekend 8-2 with a 3.01 ERA and 101 strikeouts across 83 2/3 innings, but his form had deteriorated sharply — six runs allowed over 6 2/3 innings in his past two starts. The forearm issue clouds what had been an All-Star-caliber first half and raises questions about workload management for a pitcher who topped 100 innings for the first time in his career.

Milwaukee recalled lefty Robert Gasser from Triple-A Nashville to fill the rotation spot. Gasser owns a 2-3 record and 4.15 ERA in eight major-league starts this season. The Brewers, clinging to a narrow NL Central lead, now face a critical stretch without their most reliable starter, testing organizational depth as they navigate a division race that offers little margin for error.