Manny Pacquiao (white trunks) and Keith Thurman (red/white/blue trunks) box during their WBA welterweight championship bout at MGM Grand Garden Arena, Las Vegas, NV, USA, July 20, 2019. Pacquiao beat defending champion Keith Thurman on a split points decision on Saturday to take the WBA Welterweight Super Championship at the end of an electrifying fight in Las Vegas. Joe Camporeale-USA TODAY Sports via Reuters

Manny Pacquiao (white trunks) and Keith Thurman (red/white/blue trunks) box during their WBA welterweight championship bout at MGM Grand Garden Arena, Las Vegas, NV, USA, July 20, 2019. Pacquiao won via split decision. Two judges scored it 115-112 to Pacquiao and another gave it 114-113 to Thurman, who suffered his first defeat in 30 fights. Joe Camporeale-USA TODAY Sports via Reuters

Manny Pacquiao (white trunks) and Keith Thurman (red/white/blue trunks) box during their WBA welterweight championship bout at MGM Grand Garden Arena, Las Vegas, NV, USA, July 20, 2019. Pacquiao won via split decision. "The knock down was a big factor," said Pacquiao, who became the oldest welterweight champion in boxing history. Joe Camporeale-USA TODAY Sports via Reuters

Manny Pacquiao (white trunks) and Keith Thurman (red/white/blue trunks) box during their WBA welterweight championship bout at MGM Grand Garden Arena, Las Vegas, NV, USA, July 20, 2019. Pacquiao won via split decision. Thurman had vowed to beat the 40-year old Filipino into retirement, but he was behind from the first round at the MGM Grand. Joe Camporeale-USA TODAY Sports via Reuters

Manny Pacquiao (white trunks) and Keith Thurman (red/white/blue trunks) box during their WBA welterweight championship bout at MGM Grand Garden Arena, Las Vegas, NV, USA, July 20, 2019. The 30-year old American had a height, reach, and age advantage but he got knocked down with less than a minute to go in the first round and was chasing the fight from then on. Joe Camporeale-USA TODAY Sports via Reuters

Manny Pacquiao (white trunks) celebrates after defeating Keith Thurman (not pictured) in their WBA welterweight championship bout at MGM Grand Garden Arena, Las Vegas, NV, USA, July 20, 2019. Pacquiao won via split decision. Joe Camporeale-USA TODAY Sports via Reuters