Mason Black

The Royals acquired right-hander Mason Black from the Giants on Tuesday in exchange for Logan Martin. Black had been designated for assignment by San Francisco last week and will now join Kansas City’s 40-man roster. The 25-year-old spent most of the 2025 season at Triple-A Sacramento, posting a 5.81 ERA and 1.48 WHIP with 114 strikeouts and 62 walks across 119.1 innings.

Fantasy Impact

Black has primarily worked as a starter in the minors, though it’s unclear whether the Royals intend to keep him in that role. He still has minor-league options remaining.

The San Francisco Giants designated pitcher Mason Black for assignment on Thursday. The move removed Black from the 40-man roster to make room for Reiver Sanmartin, who was claimed off waivers from the Reds in a corresponding transaction.

Fantasy Impact

Black's removal from the 40-man roster follows a difficult 2025 campaign spent mostly at Triple-A Sacramento. In 119.1 innings at that level, he struggled to a 5.81 ERA and 1.48 WHIP, posting a 114:62 K:BB ratio.

The Giants optioned Mason Black to Triple-A Sacramento.

Fantasy Impact

Black gets sent back down to Triple-A. Tristan Beck was recalled as the corresponding move.

The Giants recalled Mason Black from Triple-A Sacramento.

Fantasy Impact

Black gets called up to add another arm for San Francisco. Carson Seymour was optioned as the corresponding move.

Mason Black said the Giants have re-assigned him to minor league camp.

Fantasy Impact

The Giants are expected to have other roster moves announced at some point on Wednesday, Black struggled across eight starts (nine appearances) in the majors last season where he posted a 6.44 ERA. He could be called back up at some point this season.