DURHAM, N.C. — Mason Plumlee had 21 points and 15 rebounds, and No. 1 Duke beat Elon 76-54 on Thursday night for its 100th straight nonconference win at Cameron Indoor Stadium.

Ryan Kelly added 14 points, freshman Rasheed Sulaimon had 13 and Tyler Thornton hit a pair of key 3-pointers 30 seconds apart that helped the Blue Devils (11-0) pull away.

Playing on back-to-back nights, Duke counted on its defense to pick up an offense that was off on more open shots than usual. Duke shot 43 percent but forced 17 turnovers and turned them into 19 points while holding the Phoenix to just five offensive rebounds.

Sebastian Koch scored 14 points but Elon (6-5) was denied its first win over an Atlantic Coast Conference team since 2005.

Quinn Cook added 10 points for Duke, which hasn’t lost to a non-ACC team at Cameron since falling to St. John’s on Feb. 26, 2000.

The Blue Devils outscored Elon 29-10 during a defense-driven 13-minute stretch that began in the first half and ended midway through the second. Thornton connected on the second of his two 3s two possessions before Sulaimon capped it with a 3 that made it 54-35 with about 10:45 to go.

Thornton then made it a 20-point game for the first time when his jumper with 6½ minutes left made it 63-43.

That capped a rather successful four-day span for the Blue Devils, who returned to No. 1 for the first time since February 2011, rolled to a couple of nonconference wins and picked up a nationally televised oral commitment from Jabari Parker, one of the most highly touted recruits in years.

Plumlee, who has scored at least 16 points in every game, finished with his fourth 20-point performance of the season and picked up a pair of senior classmates whose shooting was a bit off: Seth Curry, who has played all season with persistent shin pain, was 3 of 10 while Kelly was 4 of 13.

The Blue Devils also had a short bench: Marshall Plumlee, Mason’s younger brother who played 2 minutes Wednesday night against Cornell in his season debut, had a boot once again on his left foot, leaving Duke with just nine scholarship players. He missed nine games with a stress fracture in that foot.

Lucas Troutman had 13 points and Jack Isenbarger finished with 12 for Elon.

Just as they did the night before in what became a 41-point win over the Big Red, the Blue Devils had decent numbers early but not much of a working margin to show for it.