The Athletics have reached an agreement with right-hander Mark Leiter Jr. on a contract, according to Robbie Hyde of Foul Territory. Ken Rosenthal of The Athletic notes that the deal is pending a physical. According to Jesse Rogers of ESPN, the deal guarantees Leiter “around” $3MM.
Leiter, 35 in March, made his big league debut back in 2017 but didn’t fully establish himself at the big league level until joining the Cubs in 2022. He served as a swing man and long reliever for Chicago that year, with a 3.99 in 67 2/3 innings of work in that role, but moved to a short relief role full-time in 2023. In 100 2/3 innings of work for the Cubs over the next two seasons, Leiter pitched to a 3.75 ERA with a 3.12 FIP while striking out 30.9% of his opponents and walking 8.8%.
Those exciting peripherals were enough to convince the Yankees to swing a trade for the right-hander at the 2024 trade deadline, but he struggled in New York even as his peripheral numbers remained strong. In 70 innings of work for the Yankees over parts of two seasons with the club, Leiter posted a 4.89 ERA despite a 4.07 FIP. In 2025, Leiter struck out 24.7% against a 7.8% walk rate while generating grounders on 45.5% of his batted balls allowed. Unfortunately for the righty, the results weren’t there enough for the Yankees to tender him a contract last month, and he wound up reaching free agency a year earlier than anticipated.
Headed into 2026, the A’s can expect Leiter to be a solid middle relief arm at least. His 4.15 ERA over the past four seasons is exactly league average (100) by ERA+, and the right-hander’s impressive splitter actually makes him particularly effective against left-handed batters. In 104 2/3 innings of work against lefties the last three years, Leiter has posted a 2.49 ERA and 2.57 FIP with a 32.1% strikeout rate. With league average results overall and elite numbers against lefties, Leiter has a much higher floor than a typical non-tendered middle relief arm, which is surely why he was able to command a solid guarantee even coming off a tough year in New York.
Leiter hasn’t managed to play up to his peripherals throughout his career, but if he can do so he could wind up a valuable setup man for the A’s this year. The righty’s 3.13 SIERA over the past three seasons ranks 13th among relievers with at least 150 innings of work since the start of the 2023 season, and that puts him on a similar level to well-regarded late-inning arms like Luke Weaver. Leiter’s .359 BABIP and 66.5% strand rate over the past two years indicate extremely poor fortune when it comes to batted balls and sequencing; if those numbers experience enough positive regression to get within spitting distance of league average, Leiter’s a good bet to be impactful at the back of the A’s bullpen next year.
More to come.


