The Giants have claimed reliever Reiver Sanmartin and outfielder Justin Dean off waivers from the Reds and Dodgers, respectively. They opened a 40-man roster spot by designating righty Mason Black for assignment. The moves were relayed by Alex Pavlovic of NBC Sports Bay Area.
Sanmartin, 29, has pitched parts of four MLB campaigns with Cincinnati. He has only made one big league appearance over the past two seasons, tossing 1 2/3 frames while allowing an unearned run against the Blue Jays on September 2. The Colombian-born southpaw otherwise pitched the entire season with Cincinnati’s top farm team in Louisville. He had a strong year, working 67 1/3 innings of 2.67 ERA ball behind a 58.7% ground-ball rate.
Dean is a speed and defense center fielder who just won a World Series with Los Angeles. He got into 18 regular season games and made 13 more appearances in the postseason. They only let him bat twice — he went 0-2 with a strikeout — but clearly valued him as a depth piece. The 28-year-old Dean (29 next month) has a full slate of minor league options and is coming off a .289/.378/.431 showing with 27 steals in Triple-A.
The moves probably spell the end of Black’s time in San Francisco. He’s a former third-round pick who was viewed as one of the organization’s more talented pitching prospects when he was called up in 2024. Black struggled to a 6.44 ERA across 36 1/3 innings during his debut season. He only pitched once in the big leagues this year, instead struggling to a 5.81 earned run average over 30 appearances (24 starts) in Triple-A.
Black will be traded or placed on waivers within the next five days. There’s a decent chance another team takes a flier. He turns 26 next month and still has a minor league option. Black sits around 93 MPH as a starter but could be a speculative relief target. He has posted middling Triple-A numbers in consecutive seasons but fanned nearly a third of opposing hitters in Double-A back in 2023.