Cleveland opened as a +650 underdog against the Warriors in the series. The Cavaliers were around +360 underdogs against the San Antonio Spurs in 2007, James' first trip to the Finals.
The Warriors opened as 12-point favorites in Game 1. That's tied for the largest point spread in a Finals game since 1991, according to ESPN Stats & Information. The Los Angeles Lakers were 12-point favorites over the Philadelphia 76ers in Game 1 of the 2001 Finals, a game won by the Sixers.
Golden State never opened as anywhere close to this big of favorite in the previous three Finals meetings with Cleveland. The Warriors were around -300 over the Cavaliers in last year's Finals. Golden State won that series four games to one.