Ukraine's Oleksandr Khyzhniak, hits the mat after a punch from Brazil's Hebert Sousa during their men's middleweight 75-kg boxing gold medal match at the 2020 Summer Olympics, Saturday, Aug. 7, 2021, in Tokyo, Japan. (AP Photo/Frank Franklin II)

Ukraine's Oleksandr Khyzhniak, left exchanges punches with Brazil's Hebert Sousa during their men's middleweight 75-kg boxing gold medal match at the 2020 Summer Olympics, Saturday, Aug. 7, 2021, in Tokyo, Japan. (AP Photo/Frank Franklin II)

Ukraine's Oleksandr Khyzhniak, is red to his corner after being knocked down by Brazil's Hebert Sousa during their men's middleweight 75-kg boxing gold medal match at the 2020 Summer Olympics, Saturday, Aug. 7, 2021, in Tokyo, Japan. (AP Photo/Frank Franklin II)

Brazil's Hebert Sousa, left, celebrates winning his men's middleweight 75-kg boxing gold medal match against Ukraine's Oleksandr Khyzhniak at the 2020 Summer Olympics, Saturday, Aug. 7, 2021, in Tokyo, Japan. (AP Photo/Frank Franklin II)