Shai Gilgeous-Alexander scored 31 points, Jalen Williams had 26 and Chet Holmgren added 24 — including 23 in the second half — to lead the Oklahoma City Thunder to an improbable 114-108 win over the Memphis Grizzlies to take a 3-0 lead in their Western Conference first-round series.The Thunder overcame a 29-point first-half deficit and didn’t lead in the game until Williams dropped in a free throw with 1:20 remaining for a 109-108 advantage. Holmgren added two free throws with 57.4 seconds left and Alex Caruso scored on a breakaway layup with 19.4 seconds to go. The Grizzlies did not score in the final 4:51.Memphis played without Ja Morant in the second half after he suffered a hip injury late in the first half. Scotty Pippen Jr. scored 28 points to lead the Grizzlies. Jaren Jackson Jr. added 22.Morant had 15 points and five assists before the injury. He was diagnosed with a left hip contusion. Without Morant, the Grizzlies were outscored 63-31 in the second half.Morant left the game with 3:15 to go in the second quarter after falling hard on his left side while soaring in for a layup on a fastbreak. Morant was undercut by Luguentz Dort on the play and hobbled slowly to the sideline after spending several minutes on the floor being attended by the Grizzlies’ training staff.Morant returned to the court to take two free throws, which he missed, before being helped to the locker room. He will be evaluated on Friday.Memphis had suffered lopsided losses in the opening two games of the series in Oklahoma City — by 51 points in Game 1 and by 19 in Game 2 — but played with renewed vigor in their home-opener.