Nationals second baseman Daniel Murphy underwent surgery Friday to repair articular cartilage in his right knee.
The Nationals say Dr. Timothy Kremchek, an orthopedic surgeon in Ohio, performed the debridement and microfracture procedure. No timetable for return has been set, but Murphy’s rehab will begin immediately and continue throughout the offseason.
It’s unclear if a specific incident led to the injury, as Murphy never missed any time on the disabled list, or if it was simply a wear-and-tear injury.
Murphy slashed .322/.384/.543 with 43 doubles, 23 home runs and 93 RBI in 2017. His batting average dropped considerably toward the end of the season, from .309 over the month of July to .263 over August.
Murphy signed a three-year, $37.5 million contract with the Nationals in Dec. 2015. He is entering the final year of that deal in 2018.