Nationals transferred RHP Craig Stammen to the 60-day disabled list.
Craig Stammen underwent successful surgery Monday to repair a torn right flexor tendon.
Craig Stammen will have surgery Sunday to repair a flexor tendon tear.
Nationals manager Matt Williams said Thursday that Craig Stammen (forearm) was diagnosed with a flexor tear following an MRI and will require surgery.
Nationals placed RHP Craig Stammen on the 15-day disabled list with right forearm stiffness.
Craig Stammen was lit up for five runs and eight hits in 1 2/3 innings out of the pen by the Braves on Friday.
Nationals and RHP Craig Stammen avoided arbitration by agreeing to a one-year, $2.25 million contract.
Craig Stammen pitched scoreless 11th, 12th and 13th innings for a win Thursday against the Mets.
Craig Stammen was hit hard in relief of Stephen Strasburg during Tuesday's loss to the Nationals, allowing five runs in an inning of work.
Craig Stammen threw four scoreless innings in relief of injured starter Stephen Strasburg to earn the win on Friday.
Craig Stammen was knocked around the park by the Giants Monday, allowing two runs on seven hits over 2 2/3 innings.
Nationals avoided arbitration with RHP Craig Stammen by agreeing to a two-year, $2.25 million contract.
Nationals recalled RHP Craig Stammen from Triple-A Syracuse.
Nationals optioned RHP Craig Stammen to Triple-A Syrcause.