Giants reliever Joel Peguero has been diagnosed with a Grade 2 strain of his left hamstring, the team announced. The team didn’t announce a return timeline, but it seems likely the hard-throwing righty will begin the season on the 15-day injured list.
A Grade 2 strain means there’s some degree of tearing. The injury can have different timelines. Yankees reliever Scott Effross was diagnosed with a Grade 2 hamstring strain around this time last year. He was on the injured list until May 18. Back in 2023, Nestor Cortes suffered the same injury in the middle of February. He was back in time to avoid a season-opening IL stay.
Those are only illustrative of the different possible timelines. The Giants will surely provide more details on a treatment plan in the coming days and weeks. Effross, for instance, received a platelet-rich plasma injection to treat his injury. It’s unclear if Peguero will do the same.
The 28-year-old Peguero had a good chance to break camp for the first time in his career. San Francisco called him up last August. Peguero impressed down the stretch, turning in a 2.42 earned run average through his first 22 1/3 innings. He only struck out 20% of opponents but got ground-balls at a 53.3% clip behind a blistering heater. Peguero averaged 99.9 mph on his sinker, the seventh-highest velocity in MLB.
Peguero’s huge arm could even make him a candidate for saves in a wide open San Francisco bullpen. Ryan Walker is the favorite to close as their only healthy reliever with much experience in that regard. Walker had an uneven 2025 season, though, so his hold on the job wouldn’t be super strong even if he wins it out of camp. First-year manager Tony Vitello will be looking for various unproven arms to step into high-leverage work in what is arguably the weakest area of the roster.
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