The Capitals won the first two games of the series in Tampa, but have lost three in a row since then.
Ovechkin, 32, has six points (three goals, three assists) in the series. He's tied with Eller for second on Washington, behind Evgeny Kuznetsov's eight points.
Ovechkin scored a 6-on-5 goal with 1:36 remaining in the third period of a 3-2 loss in Game 5 on Saturday after being held without a shot on goal until there was 3:38 left in the third. He finished with three shots on goal, seven attempts (three blocked) and a game-high six hits.
After the Capitals gave up a goal 19 seconds into the first period and fell behind 3-0 in Game 5, they know they need a better start in Game 6.
"I think we didn't get the result the last game because of that," Ovechkin said. "I [wouldn't] say we was not sharp, but I think maybe you have to try to score first and let them open up. … We'll see what's going to happen tonight, but I'm pretty sure it's going to be a different game."
The road team won each of the first four games of the series before Tampa Bay won at home in Game 5. The Capitals are 3-5 at home during the Stanley Cup Playoffs.
Unless they win there Monday, their season will end.
"Well, tonight's is the night," Ovechkin said.