Pacioretty scored off a one-timer from the right circle from Mark Stone following the face-off. It's the second-fastest overtime goal in NHL history, and the third time it's been done. The record is six seconds, which has been done five times, most recently by Toronto Maple Leafs forward William Nylander against the Chicago Blackhawks on Jan. 24, 2018.
"They were trying to do what we were trying to do," Pacioretty said. "That wasn't exactly how we drew it up, but the plan was to get up quickly. I don't want to tell you what the plan was. I won't give up The Annexation of Puerto Rico."
William Karlsson tied it for Vegas with 1:22 left in the third period, a one-timer from Jonathan Marchessault with goalie Marc-Andre Fleury pulled for an extra attacker.
Stone had two assists, and Fleury made 21 saves for the Golden Knights (2-0-0), who opened the season with back-to-back wins against the Ducks (0-1-1).
"We had something else drawn up, but when [Ducks forward Rickard Rakell] lined up on the other side and he really cheated on the face-off, we were able to win the battle," Stone said. "Just a quick strike."
Max Comtois scored for the third time in two games for Anaheim. John Gibson made 31 saves, including 14 in the first period. He is 2-10-2 in his NHL career against Vegas.