Let's go back to early in the second half of Game 1 with the Mavericks leading the Clippers by five points. It was at that point that Kristaps Porzingis, the Mavericks' best big man and second-best player, was unfairly ejected. That cost Dallas the game.
The Mavericks then whipped the Clippers, 127-114, in Game 2 on Wednesday. It was clear Dallas was the superior team. 
Keep in mind there is no homecourt advantage because these games are all inside the Orlando bubble. This reduces the zig-zag theory of situational basketball where the losing team comes back to win. Now the matchups and coaching are more pure. 
So just where are the Clippers' advantages that justify them being made a mid-sized favorite for this Game 3? I can't find them.
Kawhi Leonard and Paul George. OK, two superstars. Luka Doncic and Porzingis give the Mavericks two stars, too, with Porzingis being the best big man on the court. You can make the argument that Doncic is as valuable as Leonard. 
Coaching? I'll take Rick Carlisle over Doc Rivers especially when it comes to matchup strategy. I consider Carlisle one of the more underrated coaches in the league, while the media-savvy Rivers gets far more publicity. 
Scoring? The Mavericks had the most efficient offense in NBA history. 
Bench? The Clippers are supposed to have the best bench in the league. But key reserve Montrezl Harrell isn't in full shape yet having just played two games since being out and starting point guard Patrick Beverley likely remains out due to a calf strain. Dallas' reserves outscored the Clippers' bench by 30 points in Game 2. 
Beverley's absence is huge. He's an ace defender. The Mavericks are guard heavy and tall in the backcourt.