Watch Pacquiao vs. Rios live stream online on MMA Fighting starting at 7 p.m. ET for HBO's pre-fight show from Macau, China.
There will be four fights possibly shown on the pre-fight show:
Jason Butar-Butar vs. Harmonito Dela Torre
Ik Hang vs. Hero Tito
Rex Tso vs. Susu Sithjadaeng
Kuok Jun Ng vs. You-Jie Zeng - light middleweight
Manny Pacquiao, who has lost his two fights, will try to improve to 55-5-2 with a victory over Brandon Rios on Saturday night. Pacquaio was knocked out by Juan Manuel Marquez in the sixth round in his last boxing fight on Dec. 8, 2012.
Rios (31-1-1) is coming off the first loss of his career. He lost a unanimous decision to Mike Alvarado this past March in Las Vegas.
Saturday's pay-per-view fight will be for the vacant WBO international welterweight title.
To order the pay-per-view, which will begin at 9 p.m. ET, check with your local cable provider.