War Machine was found guilty on a total of 29 out of 34 felony charges.
Koppenhaver could face life behind bars.
War Machine whose birth name is Jonathan Paul Koppenhaver sentencing is set for June 5 at 8:30 a.m. War Machine was found guilty though of coercion, dissuading a witness, battery by strangulation, kidnapping. and multiple counts of sexual assault.
In an unusual move, Koppenhaver's attorney changed his client's plea last Thursday to concede guilt on eight domestic battery charges.
War Machine was being tried in Las Vegas for his attack on Mack, his ex-girlfriend, and a man she was with at the time, Corey Thomas.
His ex-girlfriend, Christine Mackinday, and Corey Thomas testified that they were asleep in Mackinday's home when Koppenhaver burst in and beat them.
As the verdict was read, War Machine was seen shaking his head in the courtroom.
The Associated Press doesn't usually identify victims of alleged sexual assault, but Mack gave permission to use her name.
A jury in Las Vegas has resumed deliberating whether the former mixed martial arts fighter named War Machine is guilty of attempted murder and other charges in an attack on his porn star ex-girlfriend and her male friend in August 2014.
Two charges of attempted murder left the jury hung after deliberation and the judge in the case declared a mistrial on both counts.
A court official says the jury resumed work Monday morning.