Klay Thompson scored 23 points and the Golden State Warriors set an NBA playoff record with 21 3-pointers to overcome another injury to Stephen Curry and beat the host Houston Rockets, 121-94, on Sunday for a 3-1 series lead.

Curry will have an MRI on Monday after spraining his right knee on the final play of the first half. He slid awkwardly to the court while defending.

Curry looked to have trouble putting weight on the knee before jogging with a limp to the locker room. He came out with the team after halftime but sat on the bench for most of the warm-up time.

After talking with coaches, he returned to the locker room. It was his first game back ­after missing the last two games with a sprained right ankle.

The Warriors bested the NBA record they shared for 3s in a playoff game when Brandon Rush made one from the top of the key with about 2½ minutes left. The Warriors made eight 3s in the third quarter to set a franchise playoff record for 3-pointers in a period.

Dwight Howard led Houston with 19 points and 15 rebounds. James Harden had 18 points, 10 assists and seven steals.

Thompson led the way from long range, going 7 of 11, and Draymond Green made four.

Andre Iguodala added a season-high 22 points and Green finished with 18.

Cavaliers 100, Pistons 98 — Kyrie Irving scored 20 of his 31 points in the second half, and visiting Cleveland finished off a four-game sweep of Detroit.

The Pistons had a chance at the end, but Reggie Jackson’s wild shot at the buzzer was off the mark.

Spurs 116, Grizzlies 95 — Kawhi Leonard scored 21 points as San Antonio rolled in Memphis, sweeping the first-round series, 4-0. The game was delayed 20 minutes in the second quarter because of a power surge that knocked out the lights.