Aaron Wiggins scored 21 points off the bench and Jalen Williams added 20 as the Oklahoma City Thunder earned a 131-80 home rout in Game 1 of their Western Conference playoff series.The Thunder had plenty of blowout victories in the regular season, setting an NBA record for scoring margin in running away with the top seed in the West. They had also rolled past the Grizzlies in all four regular-season meetings by 13 or more points.But this blowout was at a different level.Oklahoma City’s 51-point victory was the fifth-largest in NBA playoff history, according to ESPN, and the largest in the first game of a playoff series.The Thunder, with the league’s top-ranked defense, smothered Memphis from the start.Ja Morant and Jaren Jackson Jr., the Grizzlies’ top two scorers, finished a combined 8 for 30 (26.7 percent) from the field and 1 of 10 from beyond the arc. Morant was 1 of 6 from deep.Memphis managed just 20 points in the first quarter and things only got worse.Oklahoma City started the second quarter with a 23-2 run, scoring on 10 consecutive possessions, to turn the game into a blowout.After scoring 20 or more points in each of his final 72 games of the regular season, Oklahoma City’s Shai Gilgeous-Alexander finished with just 15 points on 4 of 13 shooting.