The Washington Nationals acquired reliever Marc Rzepczynski from the Oakland Athletics on Thursday, giving the NL East leaders another left-hander in the bullpen.
Oakland also sent $500,000 to be paid on Sept. 30 to the Nationals for minor league infielder Max Schrock.
The Nationals have reshaped their relief corps in the last month. They added closer Marc Melancon, traded Felipe Rivero, cut Jonathan Papelbon and put Sammy Solis on the disabled list.
The 30-year-old Rzepczynski is 1-0 with a 3.00 earned-run average in 56 games this season.
Benintendi on the DL
The Boston Red Sox placed rookie left fielder Andrew Benintendi on the 15-day disabled list with a left knee sprain, an injury he suffered Wednesday against Tampa Bay. Chris Young will take over as the starter in left.