Ruiz underwent knee surgery, won't be back until December

Former world heavyweight champion Andy Ruiz Jr. (34-2, 22 KOs) had surgery on his right knee. It was announced by the boxer's father. The 31-year-old Mexican-American will now return to the ring no sooner than December.

In May, "The Destroyer" won on points over Chris Arreola after a one-and-a-half year layoff. The media has speculated that Ruiz could fight Charles Martin in the fall, but such a fight won't happen anytime soon.

The injury that forced Ruiz to undergo surgery, according to his father, has plagued the former world heavyweight champion for a long time.