The Lancers (11-10, 3-5 Western Athletic Conference) used a 17-4 run to take a 57-46 lead on Heading's layup with 9:25 to go.
The Redhawks (13-10, 1-7) closed the deficit to seven on Morgan Means' 3-pointer that made it 59-52 two minutes later and Seattle would get no closer from there.
De'jon Davis had 12 points and 11 rebounds for Cal Baptist, the fourth double-double of his freshman season.
The Lancers committed just four turnovers and converted 15 points on 10 Seattle turnovers.
No. 12 Seton Hall aims to bounce back at Saint Louis
After a loss to Michigan State in a game that had all the madness of March, No. 12 Seton Hall faces another tough challenge on Saturday.
No. 14 Oregon aims to cap big week vs. Texas-Arlington
The Oregon Ducks are flying high after a quality win, and look to keep their momentum when they welcome Texas-Arlington to Eugene, Ore. on Sunday.
No. 15 Florida heads to UConn still looking for offense
The No. 15 Florida Gators hit the road for the first time this season, hoping to hit their stride on offense when they play the Connecticut Huskies on Sunday in Storrs, Conn.