Philadelphia Phillies fire manager Rob Thomson after 9-19 start

Former bench coach Don Mattingly will serve as interim manager of the Philadelphia Phillies for the remainder of the 2026 season. File Photo by Mike Zarrilli/UPI

The 2026 Phillies were 6-4 through their first 10 games. They then were 3-15 over their next 18, falling to the bottom of their division.

The Phillies have the second-worst batting average (.219) in baseball. They also totaled the third-fewest hits, runs and RBIs and own the league's second-worst on-base percentage (.294).

Manager Rob Thomson (C) led the Philadelphia Phillies to a World Series appearance in his first season. File Photo by Steve Nesius/UPI

Philadelphia pitchers logged MLB's third-worst ERA (5.13). They allowed a league-high 286 hits and .286 batting average to opposing hitters.

The Phillies promoted third base coach Dusty Wathan to bench coach to replace Mattingly. They hired Anthony Contreras as their third base coach. Contreras served as manager of the Triple-A Lehigh Valley IronPigs since 2022. Former IronPigs bench coach Chris Adamson was named Contreras' replacement.

Manager Rob Thomson led the Philadelphia Phillies to a 355-270 record. File Photo by Bill Greenblatt/UPI

The Phillies will host the San Francisco Giants (13-15) in the first of a three-game series at 6:40 p.m. EDT Tuesday in Philadelphia.