Both Tim Sylvia (25-6) and Houston Alexander (9-4) walked away with first round TKO victories on Friday night during the Adrenaline MMA IV event at the Mid-America Center in Council Bluffs, Iowa.

Syliva, who weighed in at 287 pounds, stopped Jason Riley (6-2) at 2:32 of the first round after catching the Ohio-based fighter with a left knocking him down. Sylvia swooped in quickly forcing the referee to stop the fight.

For the former UFC heavyweight champion, this is the first victory for him since Oct. 2007, when he defeated Brandon Vera at UFC 77.

Alexander won a lopsided fight against Sherman Pendergarst (11-15) in the first round at 1:51. Using low kicks to unsteady his opponent, Alexander followed it up with several knees knocking Pendergarst down to the mat forcing him to cover up. The former UFC fighter followed it up with several punches before the referee called a stop to the fight.

Alexander needed the win, as he had lost three in a row. He had been scheduled to fight Andre Gusamo at UFC 98 but a broken hand suffered during training put a stop to that.

The complete results for the Adrenaline MMA IV event are as follows:

- Tim Sylvia def. Jason Riley via TKO (strikes) – Round 1, 2:32
- Houston Alexander def. Sherman Pendergarst via TKO (strikes) – Round 1, 1:51
- Jeremy Lang def. Matt Delanoit via split decision (30-27, 28-29, 30-27)
- Alonzo Martinez def. Ryan Williams via unanimous decision (29-28, 29-28, 29-28)
- Joe Vedepo def. Webster Farris via KO – Round 1, 0:14
- Forrest Petz def. Chad Reiner via TKO (strikes) – Round 1, 2:28
- Jimmy Seipel def. Bob Tuttle via submission (rear-naked choke) – Round 1, 2:59
- Jordan Johnson def. Ryan Shell via unanimous decision (30-27, 30-27, 29-28)
- Dakota Cochran def. Bill Holcumb via TKO (strikes) – Round 1, 1:25
- Todd Meneely def. Cory McDonald via submission (Americana choke) – Round 2, 1:38
- John Hanson def. Dean Bradley via TKO (strikes) – Round 3, 1:19
- Danny Black def. Matt Bentley via submission (triangle choke) – Round 2, 1:49
- Marcos Marquez def. Dustin Smith via submission (rear-naked choke) – Round 2, 2:22

Video: Tim Sylvia vs. Jason Riley