Career
A professional competitor since 2004, Rossborough has previously competed for Strikeforce, King of the Cage and KSW.
Early career and The Ultimate Fighter
Rossborough made his professional debut in 2004. Prior to making his Strikeforce debut, he compiled a 20–14 record, fighting for various promotions. He also appeared on The Ultimate Fighter: Team Rampage versus
Team Forrest as a middleweight.
He lost in the entry round to Jesse Taylor via submission due to a rear-naked choke in the first round. Strikeforce
On September 23, 2011, Rossborough made his Strikeforce debut when he faced Lorenz Larkin in the main event at Strikeforce Challengers: Larkin versus
Rossborough, filling in for an injured Virgil Zwicker. He lost the fight via unanimous decision.
King of the Cage
Rossborough challenged Tony Lopez for his KOTC heavyweight championship on October 25, 2012 at KOTC: Gun Show.
He lost the fight via split decision. Rossborough faced Tony Lopez in a rematch for his KOTC heavyweight championship at KOTC: Devastation on April 11, 2013. In his first defense, Rossborough faced Cody East on June 22, 2013 at KOTC: East versus
West.
He lost the fight via unanimous decision. Konfrontacja Sztuk Walki
Rossborough was expected to face Karol Bedorf at KSW 26: Materla versus Silva III on March 22, 2014.
However, Bedorf pulled out of the fight due to injury.
Rossborough instead faced Marcin Różalski. He lost the fight via TKO due to punches in the second round.
Bellator Mobile Marketing Association
Rossborough made his Bellator debut against former professional boxer Raphael Butler on May 9, 2014 at Bellator 119. The fight ended in a majority draw.
Butler was docked one point due to an illegal headbutt in the first round as Rossborough had his back.
In his second fight for the promotion, Rossborough faced Bellator 2013 summer series heavyweight tournament finalist Ryan Martinez at Bellator 126 on September 26, 2014. Mixed martial arts
King of the Cage
KOTC heavyweight championship (one time)
Sugar Creek Showdown
Science Sector light heavyweight championship (one time).