In a significant blow to the first-place New York Yankees, closer Luke Weaver is expected to miss four to six weeks because of a hamstring injury, sources told ESPN's Jeff Passan on Monday. Weaver suffered the injury over the weekend during the Yankees' three-game series against the Los Angeles Dodgers. The Yankees are scheduled to begin a three-game series against the Cleveland Guardians at Yankee Stadium on Tuesday. He began the year as the primary setup man for Devin Williams before replacing Williams in the closer role in late April. Williams figures to slide back in the closer role.