BOSTON — Payton Pritchard scored a career-high 38 points and the NBA-best Boston Celtics rested their entire starting lineup in a 132-122 victory over the Washington Wizards on Sunday in the teams’ regular-season finale. Svi Mykhailiuk added 26 points and Sam Hauser 16 for Boston, which sat Jayson Tatum, Jaylen Brown, Kristaps Porzingis, Derrick White