Emerson Hancock's new groove must make Mariners consider novel rotation approach

Six years after being drafted sixth overall by the Mariners, Emerson Hancock is finally living up to the hype. In his first two outings of the season, he has posted a 0.71 ERA with a 2.49 FIP and has been the best-performing Seattle starter thus far. This breakout should only be good news, but given the team's excess of talent, they may have to resort to an unorthodox method of managing their cohort of elite rotation arms.

Emerson Hancock's 2026 breakout may require Seattle to utilize a six-man rotation

There are several reasons to believe that this is the real deal and not just the result of a lucky sample. The biggest change Hancock made was lowering his arm angle, decreasing it from 27 degrees in 2024 to just 13 degrees so far in 2026. In addition to giving him a less traditional release point, it has given his sinker a lot more action and so far, it has been his best pitch. Opposing hitters have managed to slug just .063 against it this season.

His outstanding performance at the back of the rotation has been so exciting, it may have caused people to forget that he's only there because of Bryce Miller's current place on the injured list. He's expected to miss the first month of the regular season but when he inevitably returns, will someone be forced to the minors, or can the Mariners manage to use both arms?

Six-man rotations have started to pick up steam in recent years, but they're still a rarity for several reasons. The biggest issue is that each pitcher will get fewer starts over the course of the season and few teams, if any, have six equally capable options. Teams often get around this by using the sixth starter as a long reliever in the bullpen or moving them to the minors, both of which are actions that the Mariners have taken in the past, but Hancock's recent performances have made him too good to demote.

Trading either Miller or Hancock seems like a reasonable alternative, but Seattle doesn't really have any clear needs to fill. The farm system remains one of the best around and the roster is still well-rounded, despite disappointing results from the offseason's highly-touted acquisitions.

Fortunately for the Mariners, a lack of updates on Miller's recovery will give them more time to make a decision. However, if Hancock remains dominant on the mound, the team will be forced to either try something out of the ordinary or make some tough calls.