Juan Manuel Marquez, 39, finally defeated his longtime rival Manny Pacquiao, 33, knocking him out with a devastating right hand and sending shockwaves through the boxing world.

With one second left in the sixth round, and with Pacquiao leading on all of the judges’ scorecards, Marquez sent him to the canvas after Pacquiao misfired on a punch. The Filipino boxing icon was knocked out cold for one minute and had to be revived with smelling salts. Marquez danced along the ring, celebrating his triumph.

Marquez had never been able to defeat Pacquiao. Their first fight in 2004 was ruled a draw and their subsequent two matches were awarded to Pacquiao. While Pacquiao has emerged as an international superstar on and off the ring, Marquez has been one of the most underrated fighters in boxing history. He is the first Mexican-born boxer to win the world championship in four divisions and has won seven world titles in five different classes. Despite these successes, he is often overshadowed by his flashier contemporaries such as Pacquiao and Floyd Mayweather, Jr., 35.

Coming into this fight, many wondered if Pacquiao had lost the dedication necessary to compete. Many felt he had taken on too many projects outside of boxing. He is a congressman in his native Philippines and he has also considered a career in acting, with reports of him co-starring in a movie with Sylvester Stallone, 66. In the ring, Pacquiao was coming off a shocking loss to American Timothy Bradley, 29, in July.

With this defeat, many are uncertain what Pacquiao’s next move will be. Pacquiao has said he would like to continue to fight, but members of his family, including his wife and mother are opposed. “I have long asked you, son, it is time to retire because you started boxing at such a young age,” Pacquiao’s mother, Dionisia, said in an interview with a Philippine television network. “I always pray that he will stop. I asked God to tell my son to stop.”

For those closest to him in the ring, the future is uncertain. "Possible retirement, possible rematch,” said legendary trainer Freddie Roach, 52, according to Sports Illustrated. “I'm not sure which way we're going to go right now. It really depends upon how he feels and what he wants to do. We'll get back in the gym and if I see signs of decline, I'll tell him to retire. If I don't, I'll tell him to go on."

Get Uinterview's FREE iPhone App For Daily News Updates here.

Get the FREE Uinterview iPad app here and watch our videos anywhere.

For more like this:

Boxer Hector Camacho Alive After Shooting

Boxer, Trainer And Analyst Emanuel Steward Dies At 68

Boxer Orlando Cruz Comes Out As Gay

Five-Time World Boxing Champion Johnny Tapia Dies

Boxer Paul Williams Paralyzed In Motorcycle Accident

Boxing Champ Joe Frazier Dies At 67

Oscar De La Hoya Contemplated Suicide