Jake O'Brien, a seasoned mixed martial artist, competed with a record of 15 wins, 4 losses, and no draws. He established himself in the Light Heavyweight division, weighing 205 lbs. Standing at 6' 3' with a reach of 76', O'Brien adopted an orthodox stance in the ring. In terms of performance, O'Brien demonstrated an average of 1.31 significant strikes per minute during his UFC career, with a striking accuracy of 31%. He absorbed an average of 1.92 strikes per minute and boasted a strike defense rate of 69%. Additionally, he averaged 6.39 takedowns every 15 minutes, with a takedown accuracy of 54%, and attempted 0.2 submissions in the same time frame. Throughout his career, O'Brien achieved one of his most significant victories against Christian Wellisch, who held an ELO rating of 1005, similar to his own. In his recent fight history, he won against Heath Herring via unanimous decision in January 2007 and defeated Christian Wellisch by split decision in January 2009. However, he suffered losses against Andrei Arlovski and Cain Velasquez due to knockout/technical knockout, as well as Jon Jones via submission (guillotine choke) in July 2009, marking his last recorded fight.