#1 Jaylen Brown
Jaylen Brown has been simply sensational in the two games that he's appeared in this postseason. Faced with the rather unpalatable task of guarding the likes of Giannis Antetokounmpo and Khris Middleton in the Celtics' first-round matchup, Brown has emerged with untarnished credentials on the defensive end.
On the other hand, his offense has been amazing over these 2 games. He's scored 50 points on 51.2% field goal efficiency, including a 3-point percentage of 41.2%. Brown, thus far, leads the Celtics team in scoring in these playoffs, and they've needed every single point scored by this young guard, who was the #3 pick in the 2016 NBA Draft.
Brown was particularly lethal in Game 2, going for a team-high 30 points on pretty good efficiency. If Jaylen continues to play at the same rate, the Celtics could very well end up with an unexpected sweep of the Bucks despite playing without Kyrie Irving.