The Team That Wins Game 1 Has A 71% Chance Of Winning The Series
Historically, teams that have taken Game 1 in the best-of-7 NBA Finals have a record of 49-20; a 71% win percentage. Furthermore, home teams that win Game 1 have a 79% chance of hoisting the Larry O'Brien trophy.
In other words, you can not overstate the importance of getting out to a hot start in the NBA Finals.
This bodes well for the Golden State Warriors who, despite losing Game 1 of the Western Conference Finals at home, were a remarkable 39-2 at Oracle Arena this season.
Note: Last year's Game 1 was an overtime thriller which the Warriors went on to win 108-100.