Left-hander Ross Detwiler, (4-3, 3.09 ERA) will take the mound tonight, looking to beat the division-rival Braves. Atlanta is second in the NL East, 3 1/2 games behind the Nats. For Atlanta, righty Randall Delgado will take the mound. He's 4-8 with a 4.52 ERA on the season. The Nationals are hoping their bats will stay hot at Turner Field. In their last series, a four-game set in Colorado, the Nats scored a total of 35 runs. For the Nats: LF Steve Lombardozzi CF Bryce Harper 3B Ryan Zimmerman 1B Adam LaRoche RF Michael Morse SS Ian Desmond 2B Danny Espinosa C Jesus Flores LHP Ross Detwiler For the Braves: CF Michael Bourn SS Andrelton Simmons RF Jason Heyward 3B Chipper Jones C Brian McCann LF Matt Diaz 1B Freddie Freeman 2B Jack Wilson RHP Randall Delgado