Nick Foligno scored 15:33 into the third period, Zack Smith added two goals, and the Ottawa Senators extended Tampa Bay's losing streak to four games with a 4-2 win over the Lightning on Monday night.
Daniel Alfredsson scored his sixth goal — the 395th of his NHL career — at 8:58 to tie it at 2. The Ottawa captain also earned an assist when Foligno gave the Senators a 3-2 lead, coming out from behind the net to tuck the puck past goalie Dwayne Roloson
Smith, who scored late in the second to tie it at 1, made it a two-goal lead when he scored his eighth goal at 16:19.
Craig Anderson, who stopped 30 shots, tied a career high with his third assist of the season on Alfredsson's goal.
Roloson made 27 saves.
Anderson earned his point when he charged out of his net and fed a long lead pass to Jason Spezza. Spezza carried the puck over the blue line and left a drop pass for Alfredsson, who drove a slap shot past Roloson.
Stamkos stripped the puck from defenseman Erik Karlsson to set up St. Louis' goal, which gave Tampa Bay its second one-goal lead 3:35 into the third.
With Pavel Kubina sidelined because of an undisclosed lower body injury, Gervais returned to the lineup for the first time since Tampa Bay's loss at Winnipeg on Nov. 14.
A healthy scratch for the Lightning's last eight games, Gervais scored in his first game in three weeks when his shot from the left point got past Anderson.
The Senators began a stretch of 11 of 15 games at home that will end when they host Tampa Bay again on Jan. 5.
Stamkos entered the game in a three-way tie with Ottawa's Milan Michalek and Phil Kessel of Toronto for the league lead in goals with 16. He whiffed on a chance at an open left side during a power play late in the first.
Anderson came up with a big glove save on Matt Gilroy moments later.
NOTES: The Lightning are in the midst of a stretch of six of seven games on the road. ... Anderson also had three assists with Colorado in 2009-10. ... Smith slipped on a red carpet and fell to the ice before the game when he was about to be presented with the Senators' player-of-the-month award for November.