A big hit sidelined San Jose's Matt Tennyson and fired up the Sharks.

Tomas Hertl, Logan Couture and Joe Thornton each scored two goals, powering San Jose to a 6-3 victory over the St. Louis Blues on Monday night.

Thornton also had two assists as San Jose improved to 21-9-2 on the road, matching their total road wins from last season. At home, the Sharks are just 11-12-3.

Tennyson got hurt in the first period. Blues forward Ryan Reaves rammed the defenseman into the glass behind the San Jose goal and smashed his face into the divider. Tennyson dropped flat on his back at 8:37, and Reaves received a 5-minute major for boarding and a game misconduct penalty.

San Jose turned the sequence into two power-play goals.

Hertl scored his 14th goal after Tennyson got hurt. Elliott stopped Joonas Donskoi's shot, but the puck got behind him and Hertl pushed it over the line for a power-play goal at 10:18.

Bortuzzo then got a slashing penalty, giving the Sharks a two-man advantage for 1:19.

San Jose made the short-handed Blues pay when Couture scored from in front the net at 12:59.

Elliott got hurt on the play. The Blues said he had a lower-body injury.

Jake Allen replaced Elliott and finished with 15 saves. The Blues activated Allen from injured reserve Sunday.

A power-play goal by Vladimir Tarasenko at 11:25 of the second got the Blues within one. Tarasenko, who also had two assists, took a pass from Kevin Shattenkirk at the top of the circle and snapped a quick wrist shot by goalie Martin Jones for his 29th goal.

But the Sharks scored 20 seconds later when Couture tapped in a loose puck by the crease.

San Jose made it 5-2 when Thornton scored on a backhander at 7:26 of the third period. He has 52 points in 46 career games against the Blues.

After a review, officials ruled against a Sharks challenge to allow a goal by Jay Bouwmeester at 9:50.

Thornton's empty-net goal at 18:35 ended the scoring.