Beaumont and Troutman combined to shoot 72.2 percent (13 of 18) from the field. Sebastian Koch contributed 16 points, hitting 10 of 12 from the line -- 5 of 6 in overtime -- for the Phoenix (18-8, 11-3), who have won three straight and 10 of 11.
The Catamounts led 64-61 with 2:11 left in regulation on Tankelewicz's 3-pointer. Troutman hit 1 of 2 foul shots and Jack Isenbarger hit both of his to tie it.
Catamount Josh Mendenhall's layup tied it at 69-all with 2:21 remaining in overtime, but Elon ran off seven straight points to secure the victory.