On January 11, 1999 Semerzier signed on to the U.S. Marines, where he would begin boxing training and then through a Marine Corps Martial Arts program, he learned other elements of the MMA game, which he would supplement with training at civilian gyms, most notably Linxx Academy in Virginia Beach, where he still trains and coaches. 
Professional career Edit
Semerzier stunned Wagnney Fabiano in his WEC debut at WEC 43, submitting the Brazilian jiu-jitsu ace in the first round. The submission win earned Upset of the Year honors for 2009 from Sherdog  
Semerzier faced Cub Swanson at WEC 52. It would be the last WEC fight for both men, before the merger in which the WEC was absorbed into the UFC. Swanson defeated Semerzier via a controversial split decision. The fight was hailed as a possible Fight of the Year contender, but it was never officially nominated.
Mackens is married and has four children. 
Mixed martial arts recordEdit
|Professional record breakdown|
|14||6 wins||3 losses|
|6-3||Yuri Alcantara||UFC 134||August 27, 2011||Rio de Janeiro, Brazil|
|Win||6-3||Alex Caceres||Submission (Rear-Naked Choke)||UFC Fight Night: Nogueira vs. Davis||March 26, 2011||1||3:18||Seattle, Washington, USA|
|Loss||5-3||Cub Swanson||Decision (Split)||WEC 52||November 11, 2010||3||5:00||Las Vegas, Nevada, USA|
|Loss||5-2||Javier Vazquez||Submission (Rear Naked Choke)||WEC 50||August 18, 2010||2||1:35||Las Vegas, Nevada, USA|
|Loss||5-1||Deividas Taurosevičius||Decision (Unanimous)||WEC 46: Varner vs. Henderson||January 10, 2010||3||5:00||Sacramento, California, USA|
|Win||5-0||Wagnney Fabiano||Submission (Triangle Choke)||WEC 43: Cerrone vs. Henderson||October 10, 2009||1||2:14||San Antonio, Texas, USA||Sherdog 2009 Upset of the Year |
|Win||4-0||Kenny Foster||Submission (Triangle Choke)||EFC - Elite Fighting Challenge 4||June 27, 2009||1||1:03||Norfolk, Virginia, USA|
|Win||3-0||Jason Hillicker||TKO (Punches)||Cagefest Xtreme - Evolution||April 25, 2009||1||2:01||Norfolk, Virginia, USA|
|Win||2-0||Justin Hickey||Submission (Rear-Naked Choke)||Cagefest Xtreme - Evolution||November 15, 2008||1||4:52||Norfolk, Virginia, USA|
|Win||1-0||Ryan Lamareaux||Submission (Rear-Naked Choke)||VFC 1 - Vengeance Fighting Championship||September 27, 2008||3||3:04||Concord, North Carolina, USA|
- ↑ nwi.com (2009-10-13). Mackens Semerzier on His MMA Upset of the Year: 'I Fully Expected to Win'. FanHouse. Retrieved on 2009-10-13.
- ↑ nwi.com (2009-09-29). Torres-trained Semerzier steps up, will make WEC debut. nwi.com. Retrieved on 2009-09-29.
- ↑ WEC 46: Varner vs. Henderson results. wec.tv/index.cfm (2010-01-11).
- ↑ "Mack" and "Cheese" official for "WEC 48: Aldo vs. Faber" prelims in April. mmajunkie.com (2010-03-24). Archived from the original on 2012-07-11.
- ↑ Mack 'Da Menace' Coming To Win. WEC>tv (2009-10-05). Retrieved on 2010-01-05.