Pulver took the fight to the floor late in the first, only to have opponent Brian Davidson take his back for the rear-naked choke at four minutes and 14 seconds.
Quick results of all the Titan FC 18 fights after the jump.
In the co-headliner, UFC veteran and three-time NCAA wrestling champion Jake Rosholt suffered a tough loss when he was disqualified in the third round against John Ott due to an illegal knee to a grounded opponent. Up until that point, Rosholt was winning the fight and arguably should have already won by TKO due to the amount of damage Ott received.
The 28-year-old Rosholt was joined on the card by his younger brother Jared, who improved to 3-0 with a first-round TKO victory.
Titan FC Results
Brian Davidson def. Jens Pulver via submission (rear-naked choke) - R1, 4:04
John Ott def. Jake Rosholt via DQ (illegal knee) - R3, 4:23
Rudy Bears def. Darryl Cobb via submission (rear-naked choke) - R1, 3:30
Jared Rosholt def. Kirk Grinlinton via TKO (punches) - R1, 1:37
Bobby Cooper def. Nick Budig via unanimous decision
Joe Wilk def. Jesse Zeugin via submission (anaconda choke) - R1, 3:36
Sean Wilson def. Deryck Ripley via submission (toe hold) - R1, 2:00
Notes: Drew McFedries was forced off the card due to an infection ... Rory Markham withdrew after accepting a movie role.