Fantasy baseball trade deadline watch starts with Kade Anderson and Mason Miller

The fantasy baseball trade deadline clock hits 6 p.m. ET on Monday, and CBS Sports fantasy analyst Scott White says the biggest fantasy fallout may come from the players who do not get traded.

White’s 31-player watch list centers on new jobs: a rotation spot for a prospect, a ninth-inning role for a reliever, or a lineup opening for a minor league bat. He also noted that some call-ups could still wait a couple of weeks because teams can preserve rookie eligibility for 2027, and related draft-pick incentives, by waiting until there are fewer than 45 days left.

Which fantasy baseball players could gain at the trade deadline?

In fantasy baseball, deadline winners are often the players who inherit playing time after a veteran leaves. A prospect blocked in Triple-A or a setup man sitting behind a closer can become relevant fast if a trade clears the way.

White pointed to Seattle as one of the cleanest examples. He wrote that the Mariners are reportedly listening on Luis Castillo and Emerson Hancock, a development that could finally make room for Kade Anderson, whom White called the most-stashed prospect in fantasy. Anderson’s minor league line listed by CBS Sports: 9-1, 1.27 ERA, 0.64 WHIP, 115 strikeouts and 10 walks over 77 2/3 innings.

The catch for Castillo and Hancock is park context. White said either pitcher could lose fantasy value if dealt because T-Mobile Park is so helpful to pitchers, with Castillo’s home-road split last year singled out as especially wide.

Colorado offers the outfield version of the same deadline puzzle. White wrote that the Rockies could move Mickey Moniak or Jake McCarthy to open spots for Charlie Condon and Zac Veen, two Triple-A bats who have rebuilt their prospect stock. CBS Sports listed Condon at .292 with 20 homers and a .976 OPS, while Veen was at .306 with 16 homers, 15 steals and a .944 OPS.

White warned that Moniak and McCarthy carry Coors Field risk if they leave Colorado. CBS Sports listed Moniak at .312 with a 1.033 OPS at home and .227 with a .652 OPS on the road, while McCarthy was at .321 with a .925 OPS at home and .272 with a .749 OPS away.

Why Mason Miller’s role matters so much

Mason Miller is the late-inning name to watch. CBS Sports listed him with 27 saves, a 0.82 ERA, a 0.82 WHIP and 80 strikeouts in 43 2/3 innings, but White raised the fantasy concern that a contender might use him outside the closer role, as happened after last year’s deadline deal when he worked as a setup man for Robert Suarez.

If Miller is traded, White said Padres left-hander Adrian Morejon could become San Diego’s closer. CBS Sports listed Morejon with one save, a 3.20 ERA, a 1.08 WHIP and 63 strikeouts in 56 1/3 innings.

Luke Weaver is another bullpen name with role upside. White wrote that the Mets reliever, who has a 1.93 ERA and 0.83 WHIP in his first year of a two-year deal, could interest contenders looking for a closer. He cited Weaver’s closing experience during the Yankees’ 2024 World Series run and named the White Sox, Cubs and Pirates as teams that need a closer.

Which prospects and pitchers are on the watch list?

James Tibbs could be a trade-chip bat for the Dodgers, according to White. CBS Sports listed him at .285 with 21 homers, a .946 OPS and 71 walks in the minors, and White noted he homered seven times in his first eight games this season but remains blocked by Los Angeles’ depth.

In St. Louis, White wrote that Dustin May could be moved if the Cardinals fall out of the 2026 race, which would put Quinn Mathews closer to a call-up. Mathews, according to CBS Sports, has a 1.55 ERA, 0.78 WHIP and 10.1 strikeouts per nine innings over his past nine starts.

White also identified Angels starters Reid Detmers and Jose Soriano as known trade-market names, with the Angels having no postseason shot. He wrote that a move to pitching-development standouts such as the Brewers, Dodgers or Rays could revive fantasy interest in either starter.

This story draws on original reporting from CBS Sports.