George Sherrill signs with the Mariners

On Saturday the Mariners signed former Mariner George Sherrill. He’ll earn $1.1 million and has some incentives. This isn’t the kind of sexy move that Mariners fans have been hoping for, but Sherrill is probably the odds on favorite to be the team’s late inning lefty specialist. What kind of value that has is hard to quantify, however, Sherrill may be coming off the best season of his career, and figures to enter a role that he can be very successful in.

Sherrill absolutely dominated left-handed batters last season, posting 14.16 K/9 against lefties and a 1.06 xFIP.

Age has stolen a few MPH from his fastball, but he’s throwing his slider at a career-high rate, and according to Fangraphs pitch type values this has made his fastball more valuable per 100 pitches than it has been since 2006 when Sherrill last pitched for the Mariners.