McCollum had averaged just 9.5 points on 27% shooting in his previous four games, was 7 of 13 from long range to help make up for Zion Williamson‘s scoring absence with the star forward out with a bruised right foot.
The Pelicans led 89-87 after three quarters and opened the fourth with a 15-4 run, led by five points from reserve guard Jose Alvarado, to take a 104-91 lead. The Pelicans also got 19 points each from Brandon Ingram and Larry Nance Jr., and they held Memphis to 15 fourth-quarter points.
McCollum hit three 3-pointers in the third quarter.
Morant had a 24-point first half to power Memphis to a 60-59 lead. Morant did his damage driving into the paint and also from the outside, going 8 of 12 from the floor, including 2 of 3 from long range. He also made 6 of 8 from the foul line and had three first-half steals.
Dillon Brooks added 19 for Memphis.
Morant closed the first quarter with a 45-foot, 3-pointer that beat the buzzer to break a 35-35 tie.