Bertrand was 10-for-16 shooting with three 3-pointers and made all eight free throws.
Trailing by as many as six early in the second half, Thomas picked off a Drexel pass and hammered down a dunk that lifted Towson (14-11, 8-5 Colonial Athletic Association) to a 47-46 lead with 12:43 to go and the Tigers never trailed again, snapping Drexel's string of five straight wins at home.
The Dragons (13-12, 6-6) led 40-33 at the break but Towson shot 52% in the last 20 minutes. Bertrand scored 20 points after halftime and Fobbs 15 as Towson outscored Drexel 43-29 in the second.
Camren Wynter led the Dragons with 24 points, Zach Walton added 17 and James Butler scored 13 with eight rebounds.
Towson plays Regent at home on Wednesday in a non-conference game. Drexel plays William & Mary on the road on Thursday.
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