Fellow Nats teammate Max Scherzer joined Zimmerman inside Capital One Arena for the big game.
The Golden Knights trail the Capitals 3-1, with Game 5 on Thursday in Las Vegas.
It took 43 seasons, but the Washington Capitals are finally Stanley Cup champions. Entering this year's playoffs, the Capitals had fallen in nine of the previous 10 playoff series against the Penguins. If they can get the win it would secure their first Stanley Cup in franchise history. They didn't stop there.
The Capitals have won both games that Oshie and Niskanen have taken the train to get to so, if there is a Game 6 back in Washington, fans may catch another glimpse of the pair pre-game.
Listen to the first track from Prince's posthumous album
Nine previously unreleased tracks recorded by Prince in 1983 will be released as " Piano and a Microphone 1983 " on September 21. The album will contain 9 tracks and run 35 minutes long.
With one more victory, the Washington Capitals can put an end to a long title drought for D.C. sports teams.
Washington was led by Alex Ovechkin, who in March became the 20th player in National Hockey League history to score 600 goals and just the fourth to reach that number in fewer than 1,000 games. It was a great play that gave Washington the lead with just shy of eight minutes left in the game. He found a loose puck behind Marc-Andre Fleury at 12:23 after Smith-Pelly had kicked one up from his skates to his stick and beaten the Golden Knights goalie for the second straight game. The Golden Knights won 51 - plus another 13 in the playoffs.
With temperatures hitting 37 C outside T-Mobile Arena, the heat was turned up before the opening faceoff as Ovechkin and Fleury exchanged not-so-friendly love taps near centre ice in warmups, but nothing really materialized out of the exchange.