Stephen Strasburg pitched seven innings of one-run ball, striking out seven, in a no-decision against the Giants on Tuesday.
Rafael Soriano took his third blown save after giving up a run in the ninth against the Giants on Tuesday.
Danny Espinosa went hitless in a fourth straight game Tuesday, leaving him with a .159 average in 139 at-bats.
Nationals prospect Anthony Rendon started at second base Monday night for Double-A Harrisburg.
Nationals purchased the contract of LHP Fernando Abad from Triple-A Syracuse.
Nationals recalled RHP Yunesky Maya from Triple-A Syracuse.
Nationals optioned OF Eury Perez to Triple-A Syracuse.
Nationals placed RHP Ryan Mattheus on the 15-day disabled list, retroactive to May 20, with a fractured right hand.
Craig Stammen was knocked around the park by the Giants Monday, allowing two runs on seven hits over 2 2/3 innings.
Zach Duke was rocked for four runs on seven hits over 3 1/3 innings in a loss to the Giants on Monday.
Ross Detwiler reported improvement with his back Monday and hopes to be ready to make his next start.
Jayson Werth (hamstring) will not be ready for activation from the disabled list on Friday and could be sidelined for as much as two more weeks.
Bryce Harper (knee) is back in the Nationals' lineup Monday.
Dan Haren was pulled in the fifth inning after giving up seven runs Sunday in a loss to the Padres.
Nate Karns allowed three runs on seven hits over six innings and had six strikeouts in his start Friday at Double-A Harrisburg.