Vasiliy Lomachenko does not agree with his upset loss to Teofimo Lopez.

On Saturday night at the MGM Grand's Conference Center in Las Vegas, Lopez pulled off the shocker when he handed Lomachenko his first defeat in six years with a twelve round unanimous decision to unify the IBF, WBC Franchise, WBO and WBA titles.

The scores were 119-109, 117-111 and 116-112.

Lomachenko, a three division champion and two-time Olympic gold medal winner, was a 3-1 favorite.

Lopez raised his undefeated record to 16-0 with 12 knockouts, and at 23-years-old he became the youngest fighter to become a four belt undisputed champion. He knocked out Richard Commey in two rounds back in December.

Lomachenko, who dropped to 14-2 with 10 knockouts, was coming off a unanimous decision victory over Luke Campbell last August in London.

He did very little for the first half of the contest, but began to pick up the pace in the seventh round. Lomachenko rallied for most of the second half, with Lopez staging a rally of his own in twelfth.

“I think in the first half of the fight, he got more rounds than I did, but in the second half of the fight, I took it over and I was that much better,” Lomachenko said.

“I want to go home and see what I can do better. I’m definitely not agreeing with the scorecards. I thought I won the fight, but the results are the results, and I’m not going to argue it right now. Right now, I’ll go home and we’ll discus what I'm going to do next [in the future]."