The Heat defeated the Celtics, 88-78. Mychal Mulder led all scorers with 23 points and four rebounds for the Heat, while Haywood Highsmith added 14 points, six rebounds and three assists in the victory. JD Davison tallied 10 points, six rebounds and six assists for the Celtics in the losing effort. The Heat improve to 1-0 in the NBA 2K23 Summer League, while the Celtics fall to 0-1.