The Vegas Golden Knights took Game 1 of the Stanley Cup Final on Saturday, winning 5-2 over the Florida Panthers. Here’s what you need to know: Panthers forward Eric Staal opened the scoring at 9:40 in the first period. The Golden Knights scored two unanswered goals, thanks to Jonathan Marchessault and Shea Theodore. Florida forward Anthony Duclair tied the game at 19:49 in the second period. Zach Whitecloud and Mark Stone scored in the third period, sealing the Golden Knights’ win. Game 2 is set for Monday at 8 p.m. ET. The Athletic’s instant analysis: Marchessault stays hot Marchessault didn’t…