By James Hammer in Vegas

At just 23 years old, Teofimo Lopez became the undisputed lightweight champion of the world by dethroning Vasiliy Lomachenko over 12 tense rounds inside the MGM Grand Conference Center last night.

Lopez becomes the youngest fighter to become a four-belt champion since the WBO was founded in 1988.

After a strong start, Lopez overcame a late Lomachenko rally to win by the scores of 116-112, 119-109 and 117-111.

The bout was dominated early by the boxing of Lopez, who controlled the center of the ring by using his educated left hand and then hit Lomachenko with well-placed body shots that had the smaller boxer backing up.