Mariners' Pitchers Fantasy Baseball Preview | Logan Gilbert, Bryce Miller, Andres Munoz, George Kirby, Bryan Woo and More

After looking at some of the top Seattle Mariners hitters earlier, it's now time to discuss some of the team's top pitchers.

We've covered the Colorado Rockies (hitters and pitchers), Tampa Bay Rays (hitters and pitchers), Atlanta Braves (hitters and pitchers) and Chicago White Sox (hitters and pitchers) so far.

Check out Fantasy Baseball Average Draft Position data for 2025 and get ready for your fantasy drafts by utilizing the FantasySP Fantasy Baseball Mock Draft Simulator. Also be sure to check out the FantasySP 2025 Fantasy Baseball Draft Kit!

Top Fantasy Pitchers

There's several Seattle pitchers inside the Average Draft Position list so far.

Logan Gilbert is the top-drafted Mariner so far, going around pick 26.06 on average. George Kirby goes at pick 43.71 on average.

Bryce Miller is next up at pick 70.06 on average. Luis Castillo isn't far behind at 75.82.

Closer Andres Munoz is at pick 107.76 right now. Starter Bryan Woo also makes the list, at pick 166.47.

This Seattle rotation is a monster, and it's a shame the team's hitters were so poor last season, because even an average offense could have made the team a tough out in the postseason.

Gilbert is projected to be the team's No. 1 starting pitcher. He was the top fantasy scorer in points leagues for the team last season.

In 33 starts, Gilbert went 9-12, but with a good 3.23 earned run average. He struck out 220 batters over 208 2/3 innings.

It was the third straight season Gilbert has made at least 32 starts, and he continued to add to his innings and strikeouts, while posting the second-lowest ERA of his career. 

Simply put, Gilbert is one of the better fantasy pitchers in the game. More run support could help him contend for the top fantasy pitcher slot in 2025, and I'd have no problems using Gilbert as my No. 1 fantasy starter.

Kirby was third on the team in fantasy points last season, but is going second and is projected to be the No. 3 starter.

In 33 starts in 2024, Kirby had a 3.53 ERA and a 14-11 record. He struck out 179 batters over 191 innings. It was the second straight season Kirby has reached 190 innings, and he posted similar win totals and ERAs in those campaigns.

I'm a big fan of Kirby as a fantasy asset, but comparing numbers to his teammates, I think Kirby might be a touch overrated going into 2025. I still have him as the No. 10 fantasy pitcher in 2025, and he's going 11th among SP, so that's pretty fair. 

His ADP might continue to drop as the season nears, so you might be able to draft him far later than his current mark, at which point Kirby could become a big draft steal.

Miller actually outscored Kirby in points leagues last season, but he's going nearly 30 picks later and is the team's No. 4 starter.

He took a monster step forward from his rookie season in 2023. In 31 starts last season, Miller had a 12-8 record and 2.94 ERA. Miller struck out 171 batters over 180 1/3 innings.

His ERA dropped 1.38 from year one to year two, so I understand fantasy owners not being fully on board with Miller yet. Even if he regresses a bit in the ERA department, a few more innings and strikeouts could make up for that. I like the value Miller presents at his current ADP.

Castillo took a step back in 2024, but still posted some pretty solid overall numbers.

In 30 starts, he went 11-12 with a 3.64 ERA (that's barely over his career mark). He posted 175 strikeouts in 175 1/3 innings.

Castillo should be the No. 2 starter in Seattle behind Gilbert, and I wouldn't be surprised if Castillo fares a little better than he did in 2024. He's 32 years old, so I don't expect a massive dropoff, and a little bounceback is definitely possible.

I'm fine taking Castillo around his ADP, but wouldn't want to if it rose much more.

Woo is the team's No. 5 starter, which is quite the luxury.

He took a massive step forward in his second MLB season. Woo was limited to 22 starts, but went 9-3 with a 2.89 ERA in those starts. He struck out 101 batters over 121 1/3 innings.

Even if he regresses with his ERA, if Woo gets in close to a full season of starts, I see him as a big draft steal candidate. He's a low risk and high upside pick for his current ADP.

Munoz is another draft steal candidate of mine. 

In 60 games last season, Munoz went 3-7, but had a 2.12 ERA and 22 saves. He struck out 77 batters over 59 1/3 innings.

Some injuries have held Munoz back over his career, but if he's able to get in a full season, there's a chance he's a huge draft steal. He already strikes out a ton of batters, and that would increase with more innings. His saves and innings would also increase, helping him be a much better fantasy asset than any previous season.

Other Starting Options

With already having discussed five starters and the closer, there's not many pitchers left to mention from the Mariners.

Collin Snider and Gregory Santos are projected to set up Munoz for saves. Trent Thornton, Tayler Saucedo, Eduard Bazardo and Gabe Speier are other relief options, while Carlos Vargas is the projected long reliever. 

Matt Brash and Jackson Kowar are dealing with injuries. Brash could be a late-inning option and is expected to return in April or May. Kowar's return date is not known, but he could be another bullpen piece when ready.

I don't see any of the bullpen arms being big fantasy assets unless Munoz or a starting pitcher goes down with an injury.

Top Prospects

Seattle has no pitching prospects inside the top 100, but that's fine seeing the rotation and bullpen now.

Taylor Dollard is a top-30 prospect of the team from the end of 2024 who could be one of the first calls if a starter were to go down. He has a 3.60 ERA over three minor league seasons, but has only logged 8 1/3 innings over the past two seasons because of an injury. He's a name to keep an eye on in dynasty leagues in case he gets his career back on track, although a trade or injury might be his only routes into an MLB rotation.

Emerson Hancock got 12 MLB starts in 2024, posting a 4-4 record and 4.75 ERA. He's another option to get a call up if a Seattle starter is injured.

Logan Evans is another starting pitcher who is in camp with the team this spring training. He has a 2.88 ERA across 122 minor league innings, but probably needs more minor league seasoning before getting a call up.

Brandyn Garcia is another starter under 25 years old who is in camp with the team this spring. He has a 2.21 ERA across 126 minor league innings so far.

Troy Taylor is on the active roster and got in 19 1/3 MLB innings out of the pen last season, so he's another reliever who could help.

Hunter Cranton is the only other reliever under 25 years old who is at camp this year. He had a 3.24 ERA across just 8 1/3 innings in his first year in the minor leagues, so he needs more seasoning before being an option.