Quinn Cook scored 22 points to help No. 1-seeded
Freshman Jahlil Okafor added 21 as the Blue Devils (30-4) wasted little time getting their offense revving, hitting their first seven shots and 12 of 15 to quickly build a big lead.
That's not to say everything went smoothly for Duke, a team with half of its eight scholarship players making its tournament debut. Hall of Fame coach
After Robert Morris (20-15) pulled within 10 midway through the second half, the Blue Devils ran off 12 straight points with a suddenly dominant burst to push the lead back to 68-46 on Amile Jefferson's transition layup with 8:29 left.
Duke was in command from there for a routine 1-vs-16 finish, shooting 63% in the program's 100th NCAA tournament victory.
Duke advanced to play the St. John's-San Diego State winner on Sunday in the round of 32. The Blue Devils are a No. 1 seed for the 11th time in 18 seasons, though this is their first since 2011.
More importantly, Duke got off to a good start in the tournament after a pair of shocking one-and-done exits in the past four seasons, both coming in its home state of North Carolina.
Cook made 8 of 12 shots, including a 6-for-10 performance from behind the arc.
Meanwhile, Okafor had a strong start, too. Facing a hopelessly undersized front line, the freshman finished 9 for 11 from the field and played just 21 minutes.