Alex Pietrangelo had a goal and an assist, Oskar Sundqvist, Colton Parayko and Robert Thomas scored, and Jake Allen made 23 saves for the Blues (16-18-4), who have won three of their past five games and are 2-2-0 during a five-game homestand. David Perron and Ryan O'Reilly each had two assists.
"Tonight was just work," Pietrangelo said. "We outworked them, especially in the offensive zone. The penalty kill was good. The power play was good in the second period there. I think we simplified and started getting shots, and all of a sudden, the momentum started changing. I think we had about 40 shots, and we only gave up 25]. When you give up [25] shots against that team, you're doing something right defensively. I thought we did a real good job keeping them out of our end."
***[WATCH: [All Capitals vs. Blues highlights | Ovechkin scores 30 goals for 14th time with Capitals]*
Ovechkin is the second player in NHL history with 14 straight 30-goal seasons to begin his career. Ovechkin joins Mike Gartner, who did it his first 15 seasons (1979-80 through 1993-94), with the Capitals, Minnesota North Stars, New York Rangers and Toronto Maple Leafs.
"It's nice to be in that company (with Gartner) but still a long way to go (in my career)," Ovechkin said.
Ovechkin, Gartner (15) and Jaromir Jagr (15; 1991-92 through 2006-07) are the only NHL players to score at least 30 goals in 14 or more consecutive seasons.
Ovechkin had not scored in six straight games.
"It's amazing what he's done, and that was encouraging," Capitals coach Todd Reirden said. "... He's just an elite, elite scorer that we're so fortunate to have on our team and the League is even fortunate just to have this type of a player that's a generational talent. To score 30 again this year is quite an accomplishment after going through a long season last year, and he continues to get a year older, but he still does the phenomenal things. Just the way he's able to score goals is unmatched for the most part."