Mercer (15-9, 8-3 Atlantic Sun Conference) has won 12 straight at home in Hawkins Arena.
After Kordario Fleming's layup gave Jacksonville the lead 58-57 with 8 seconds left, Hall went one of two from the foul line to send the game into overtime.
Tied 62-62 in overtime, Hall's layup put the Bears ahead 64-62 with 1:54 left, but Javon Dawson answered with two free throws to tie it again 64-all.
After a turnover by Jacksonville's Russell Powell, Smith made a 3-pointer with 30 seconds left to put the Bears on top 67-64. Dawson missed a 3-pointer with 3 seconds.
Jarvis Haywood led Jacksonville (12-13, 7-5) with 13 points and Fleming added a double-double, 10 points and 11 boards.
Is there a link between recruiting wins and success? Kentucky and LSU are among teams that have recruited well, but haven't reached their expectations.
Purdue junior forward Vincent Edwards, who has averaged 19.0 points in the NCAA tournament, has decided not to pursue the NBA for now.
Kansas-Kentucky is not only the headliner of the Big 12/SEC Challenge but arguably the most intriguing. We rank all the games in the January event.