Bradley Beal, the NBA’s leading scorer, pumped in 37 points and the Washington Wizards extended their winning streak to four games by pounding the visiting Detroit Pistons, 121-100, on Saturday.Ish Smith had 16 points and five assists off the bench, while Russell Westbrook supplied yet another triple-double with 15 points, 14 rebounds and 11 assists for the Wizards, who have won six of their last seven games.Robin Lopez added 15 points and five rebounds as Washington won the season series 2-1.A pair of the Wizards’ starters had their night cut short by injuries. Alex Len departed in the first half with right ankle soreness, while Rui Hachimura exited in the third quarter with a left knee strain.Isaiah Stewart scored a career-high 19 points and grabbed 12 rebounds for the Pistons. Frank Jackson also scored 19 points and Josh Jackson contributed 17. Jerami Grant added 14 points but shot 4-for-14 from the field.Washington, which never trailed, shot 53.2 percent from the field and outscored Detroit 74-46 in the paint. Both teams were playing the second game of a back-to-back.Beal had 19 halftime points as the Wizards established a 61-55 lead. Westbrook accumulated seven points, 10 rebounds and 10 assists prior to the break as Washington shot 50 percent from the field.