After Nevada took its only lead of the second half at 56-54 with 8:16 to play, Pacific assumed command with a 15-0 run while holding the Wolf Pack scoreless for more than seven minutes.
But Nevada rallied with 10 points in the final 57 seconds to get within 69-66 before Troyer's free throw sealed the win with two seconds remaining. Pacific missed five consecutive free throws in the final 35 seconds to let Nevada back in the game.
Marcelus Kemp scored a game-high 20 points and had 12 rebounds to lead Nevada (2-4), which is coming off four consecutive appearances in the NCAA Tournament. Brandon Fields had 16 points and JaVale McGee scored 13 for the Wolf Pack.
Pacific put the clamps on Nevada in the second half, limiting the Wolf Pack to just 31 percent shooting from the field in the final 20 minutes. But the Tigers made only 11 of 20 free throws after halftime, including just four of 11 in the final 2:40.
Both teams came out hot from long range as Pacific made 6 of 9 3-pointers in the first half while Nevada connected on 5 of 10. The two teams combined to go just 3 of 18 from beyond the 3-point arc in the second half.
The game was tied four times and there were four early lead changes before Pacific gradually built a 29-20 advantage with 7:41 remaining before the intermission.
Nevada cut that lead to one point at halftime as Kemp made a jump shot, then tossed in a 30-foot 3-pointer when nobody guarded him on the inbounds pass with one second left on the clock.
The second half then became a game of streaks as Pacific began the half with a 12-5 run before Nevada rallied.