The Boston Celtics opened as -225 favorites in the NBA Finals at ESPN BET.
The Mavs, who started the season with 25-1 odds of winning the title, are +185 underdogs.
Jayson Tatum is the favorite to win Finals MVP at -130, with Luka Doncic second at +200.
The odds reflect Kristaps Porzingis returning to the Celtics lineup for Game 1.