January 6, 2026

The San Francisco Giants have designated outfielder Justin Dean for assignment to make room for right-hander Tyler Mahle, according to Susan Slusser of the San Francisco Chronicle. Dean never appeared in a game for the Giants after being claimed off waivers in early November. The 29-year-old most recently played for the World Series-champion Los Angeles Dodgers, appearing in 18 games last season, primarily as a pinch-runner. Mahle joins a Giants starting rotation that includes Logan Webb, Robbie Ray, Adrian Houser, and Landen Roupp. The 31-year-old righty spent the past two seasons with the Texas Rangers, where he posted a 2.54 ERA with 76 strikeouts across 99 1/3 innings. However, durability remains a major concern. Since 2022, Mahle has undergone Tommy John surgery and hasn't made more than 20 starts in a season. In 2025, he missed 85 games with right-shoulder fatigue, and his declining velocity only adds to the concerns. His fastball, which averaged around 94 mph in 2021, dipped to roughly 92 mph last season. While Mahle still does a solid job locating the ball, and Oracle Park is pitcher-friendly, he's mainly a fantasy option for deeper formats, like 15-team leagues. Even then, it's best to leave him on the waiver wire to start the season until he proves he can stay healthy and that his stuff can still play at the major-league level.--Marty Tallman
Source: Susan Slusser