Jonathan Marchessault scored his first career shootout game-winning goal and the Vegas Golden Knights beat the Ottawa Senators 3-2 on Thursday night.

Vegas fired a franchise-record 54 shots on goal, but needed the extra period to earn the two points.

More Images
Ottawa Senators goaltender Anders Nilsson (31) defends against the Vegas Golden Knights during the second period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Jonathan Marchessault scored his first career shootout game-winning goal and the Vegas Golden Knights beat the Ottawa Senators 3-2 on Thursday night.

Vegas Golden Knights goaltender Marc-Andre Fleury (29) defends against the Ottawa Senators after losing one of his gloves during the second period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Reilly Smith and Nick Holden scored for Vegas.

Vegas Golden Knights right wing Mark Stone (61) and center Jonathan Marchessault (81) celebrate after Marchessault's shootout goal against the Ottawa Senators during an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. The Golden Knights won 3-2. (AP PhotoDavid Becker)

Anders Nilsson, who lost his only previous start against Vegas by allowing five goals, made 52 saves.

Vegas Golden Knights right wing Reilly Smith (19) passes the puck past Ottawa Senators defenseman Nikita Zaitsev during the second period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

The lead wouldn't last. Chabot sent a wrist shot past Fleury to tie the game 1-1.

Vegas Golden Knights goaltender Marc-Andre Fleury (29) defends against Ottawa Senators right wing Jordan Szwarz during the first period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

NOTES: Vegas forward Valentin Zykov was suspended 20 games earlier in the day, for violating the league's performance-enhancing substances, and was replaced in the lineup by Brandon Pirri. ... Golden Knights winger Max Pacioretty played in his 700th career NHL game. ... Vegas' Gerard Gallant coached in his 500th career game. ... Ottawa center Artem Anisimov, who was scratched Monday against Minnesota because of a lower-body injury, left practice early Wednesday and was scratched again. ... Attending the game was Seattle's GM Ron Francis and scout Ulf Samuelsson.

Vegas Golden Knights goaltender Marc-Andre Fleury (29) defends against Ottawa Senators center Chris Tierney during the first period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Vegas: Begins a three-game trip at Pittsburgh on Saturday.

Golden Knights wing Mark Stone, who played 366 games for Ottawa, faced his former team for the first time. Stone was acquired from the Senators at the trade deadline in February for Oscar Lindberg, prospect Erik Brannstrom and a 2020 second-round pick.

Ottawa Senators goaltender Anders Nilsson (31) defends against the Vegas Golden Knights during the second period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Ottawa Senators goaltender Anders Nilsson (31) defends against the Vegas Golden Knights during the second period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Reilly Smith and Nick Holden scored for Vegas.

Marc-Andre Fleury made 37 saves. Fleury had a career 3.44 goals-against average against Ottawa, the highest of any other opponent, entering the game.

Thomas Chabot and Jean-Gabriel Pageau scored for Ottawa.

Vegas Golden Knights goaltender Marc-Andre Fleury (29) defends against the Ottawa Senators after losing one of his gloves during the second period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Vegas Golden Knights goaltender Marc-Andre Fleury (29) defends against the Ottawa Senators after losing one of his gloves during the second period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Anders Nilsson, who lost his only previous start against Vegas by allowing five goals, made 52 saves.

The Senators outshot the Golden Knights 5-2 in overtime, and Fleury came up with several huge saves to keep the game going.

Smith gave the Golden Knights a 1-0 lead when he took a pass from Jonathan Marchessault and backhanded a shot under Nilsson's pads 4:12 into the game.

Vegas Golden Knights right wing Mark Stone (61) and center Jonathan Marchessault (81) celebrate after Marchessault's shootout goal against the Ottawa Senators during an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. The Golden Knights won 3-2. (AP PhotoDavid Becker)

Vegas Golden Knights right wing Mark Stone (61) and center Jonathan Marchessault (81) celebrate after Marchessault's shootout goal against the Ottawa Senators during an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. The Golden Knights won 3-2. (AP PhotoDavid Becker)

The lead wouldn't last. Chabot sent a wrist shot past Fleury to tie the game 1-1.

Vegas went back on top later in the period when Holden scored his first goal of the season. On the power play, Holden's one-timer bounced off a stick and into the net. Stone earned his 200th career assist.

After a scoreless second period, the Senators tied the game when Pageau smacked a rebound past Fleury's glove just 4:25 into the third period.

Vegas Golden Knights right wing Reilly Smith (19) passes the puck past Ottawa Senators defenseman Nikita Zaitsev during the second period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Vegas Golden Knights right wing Reilly Smith (19) passes the puck past Ottawa Senators defenseman Nikita Zaitsev during the second period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

NOTES: Vegas forward Valentin Zykov was suspended 20 games earlier in the day, for violating the league's performance-enhancing substances, and was replaced in the lineup by Brandon Pirri. ... Golden Knights winger Max Pacioretty played in his 700th career NHL game. ... Vegas' Gerard Gallant coached in his 500th career game. ... Ottawa center Artem Anisimov, who was scratched Monday against Minnesota because of a lower-body injury, left practice early Wednesday and was scratched again. ... Attending the game was Seattle's GM Ron Francis and scout Ulf Samuelsson.

UP NEXT

Ottawa: Continues a three-game trip at Arizona on Saturday.

Vegas Golden Knights goaltender Marc-Andre Fleury (29) defends against Ottawa Senators right wing Jordan Szwarz during the first period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Vegas Golden Knights goaltender Marc-Andre Fleury (29) defends against Ottawa Senators right wing Jordan Szwarz during the first period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Vegas: Begins a three-game trip at Pittsburgh on Saturday.

More AP NHL: https://apnews.com/tag/NHL and https://twitter.com/AP_Sports

Vegas Golden Knights goaltender Marc-Andre Fleury (29) defends against Ottawa Senators center Chris Tierney during the first period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)

Vegas Golden Knights goaltender Marc-Andre Fleury (29) defends against Ottawa Senators center Chris Tierney during the first period of an NHL hockey game Thursday, Oct. 17, 2019, in Las Vegas. (AP PhotoDavid Becker)