After losing a double-digit lead late in the second half, Georgia State (3-1) got a pair of free throws from Isaiah Williams with just a second left in regulation to tie the game at 67 and force the extra period.
IUPUI (2-5) scored first in overtime on Darell Combs' bucket but Hollowell responded with a layup at the other end and drew the foul, sending him to the line for the 3-point play that gave Georgia State the lead and sparked a 6-0 spurt. Williams, who finished with 13 points, cemented the win with 5-of-6 shooting from the line in the final 49 seconds.
The Panthers shot 57 percent from the field and went 20 for 28 from the line.
Jordan Pickett led IUPUI with 19 points.