On a roll in August, Roark takes on Astros
(MLB.com Washington Nationals)

In a potential World Series preview, the teams with the second- and third-largest division leads will meet for a three-game Interleague series at Minute Maid Park. In Tuesday`s series opener, the American League West-leading Astros will send out right-hander Charlie Morton opposite right-hander Tanner Roark and the National League East-leading Nationals.