Martin and Etherington each hit four of Butler's 13 3-pointers as the Bulldogs made 48 percent from distance.
Creighton was within 63-58 with 8:13 left but the Bluejays did not make another field goal for nearly three minutes and trailed 71-60 after Butler's 8-2 run. Andrew Chrabascz hit a wide open 3-pointer, off an assist from Kellen Dunham, to extend Butler's lead to 79-66 with three minutes left.
Etherington and Dunham combined for three 3-pointers on three-straight Butler possessions for a 47-37 lead -- its first double-digit advantage -- early in the second half.
Maurice Watson Jr. paced Creighton (17-10, 8-6) with 22 points and six assists.
College basketball coaching changes for 2020-21
An up-to-date list of every coaching change in college basketball ahead of the 2020-21 season.
Yale's Paul Atkinson, the Ivy League co-Player of the Year, says he will transfer this spring
Yale big man Paul Atkinson announced on Monday he plans to transfer in the spring after graduating. He was the Ivy League's co-Player of the Year last season, averaging 17.6 points and 7.3 rebounds.
Richmond loses guard Nick Sherod for season with torn ACL
Richmond guard and captain Nick Sherod tore the ACL in his right knee at practice last week and has been ruled out of the upcoming season.