Ilya Kovalchuk recorded a goal and two assists while Marc Savard and Scott Mellanby each added a goal and an assist. Niclas Havelid and Eric Boulton all assisted once, and goaltender Kari Lehtonen made 19 saves for the Thrashers (17-17-6), who broke a two-game skid.
Atlanta had a big 43-21 advantage in shots on goal. The Thrashers were 3-for-9 on the power play while the Capitals went 1-for-5.
Ovechkin leads the NHL with five shoot-out goals in six tries, and remains the NHL's rookie scoring leader with 44 points (23 goals and 21 assists).