Barton could be facing a lengthy absence, though a timetable for his return has yet to be determined.
Trae Young had a historic outing Sunday as he put up the biggest numbers by a first-year player since Stephen Curry in 2010.
Trae Young scored 35 points and dished out 11 assists in the Atlanta Hawks' 133-111 win over the Cleveland Cavaliers.
The Golden State Warriors suffered a thrilling loss to the Denver Nuggets in the NBA.
Russell Westbrook missed the first two games of the NBA season but returned on Sunday.
Brandon Ingram will miss four NBA games, Rajon Rondo three and Chris Paul two following Saturday's melee in Los Angeles.
Nuggets wing Will Barton could be facing a lengthy absence with a groin injury.
Westbrook missed the first two games of the season as he was recovering from an offseason knee procedure.
Walker, who was 26 points shy of the feat, finished with 39 points to go with seven assists and five rebounds in Saturday's win at Miami.
"Obviously New York held a special place for me," Irving said Saturday. "New York was a strong consideration.”