The Philadelphia Phillies‘ coaching staff is undergoing a full-on facelift, and it’s not stopping at the manager’s office. Hours after the Phillies fired manager Rob Thomson on Tuesday following a brutal 9-19 start to the 2026 season, the organization began reshuffling the rest of the dugout. According to Philadelphia Sports Network’s Cory Nidoh, Lehigh Valley IronPigs’ manager Anthony Contreras is being promoted to serve as the new third base coach under incoming interim manager Don Mattingly.
It’s a notable jump for Contreras, who now trades the Triple-A grind for a spot in the third base coach’s box at Citizens Bank Park.
Philadelphia Phillies Promote Iron Pigs Manager Anthony Contreras
Rob Thomson’s dismissal closes the book on a tenure that stretched back to 2018, when he first joined the Phillies’ staff. He took the reins as interim manager in 2022 after Philadelphia parted with Joe Girardi, eventually earning the full-time job and guiding the club deep into October in the years that followed.
The 2026 start, though, has been a different animal. At 9-19, the Phillies are tied with the division-rival New York Mets for the worst record in Major League Baseball — a stunning outcome for a franchise with championship-tier payroll and expectations. That slide cost Thomson his job, and it opened the door for the Mattingly era to begin immediately.
Who Is Anthony Contreras?
Contreras isn’t a household name yet, but he’s a lifer in the sport with a resume that explains the promotion.
A ninth-round pick of the San Francisco Giants in the 2005 MLB Draft out of San Jose State University, Contreras spent nine seasons playing minor league baseball across multiple organizations, tallying 22 career home runs. His final stop as a player came in 2013 with the independent-league Lancaster Barnstormers in Pennsylvania — foreshadowing the state where he’d eventually build his coaching career.
He transitioned into coaching and managed for seven years in the San Diego Padres‘ minor league system before the Phillies tapped him in November 2021 to lead the IronPigs. He became just the sixth manager in Lehigh Valley’s history and has now earned the next step up — a big-league coaching gig with the Phillies.
A Staff in Transition Under Don Mattingly
For Mattingly, plugging in Contreras at third is the first of what figures to be several touches on a staff he inherits mid-crisis. The Phillies need immediate stabilization, and a familiar face from their own pipeline brings a built-in understanding of the organizational philosophy and the personnel moving between Allentown and Philadelphia.
Whether this reset is enough to salvage a season already 10 games under .500 is another question entirely. But with Rob Thomson out, Don Mattingly in, and Anthony Contreras making the jump from the IronPigs to Citizens Bank Park, the Philadelphia Phillies are betting that new voices can snap this roster out of its April fog before it becomes a lost summer.
Phillies Make Bold Change Amid Don Mattingly Shuffle