Description Unified lightweight champion Vasiliy Lomachenko fights IBF titlist Teofimo Lopez in a must-see bout Saturday night from Las Vegas. Lomachenko (14-1, 10 KOs) holds the WBA, WBO and WBC world titles and is regarded as one of the world's best pound-for-pound fighters. At 23, Lopez (15-0, 12 KOs) is nine years younger and will present Lomachenko with his toughest challenge since the Ukrainian moved up to 135 pounds in 2018.