In seven appearances this season, Belisle had allowed one run in six innings. He lobbied to rejoin the Nationals' bullpen without pitching in the Minors, but Baker wanted to make sure he was ready and has said he wants Belisle throw in back-to-back games before rejoining the team.
"He's been working hard, been working real hard," Baker said. "And he's sold on our training staff and physical fitness. He said it's the best he's ever been around."
Jamal Collier covers the Nationals for MLB.com. Follow him on Twitter at @jamalcollier. This story was not subject to the approval of Major League Baseball or its clubs.