The 33-year-old, who was born in Lebanon but lives in Germany, was due to defend his title against American Fres Oquendo, 45, in Cologne on September 29, but the fight is off after Charr tested positive for two anabolic steroids.
The talented 21-year-old from Tijuana swarmed all over the outmatched Cook from the start of a one-sided undercard contest at the T-Mobile Arena.
Mexican star Alvarez produced a performance of guts and resilience to inflict the first defeat of Golovkin's career with a majority decision at the T-Mobile Arena.
In a posting on Instagram, Mayweather said he will come out of retirement to fight Pacquiao, three years after scoring a comfortable points victory over the veteran Filipino.
The 26-year-old former American Olympian knocked down Orozco twice in the first defence of his title in front of his home crowd at the Save Mart Center arena in Fresno, California.
World middleweight king Golovkin takes on Saul "Canelo" Alvarez in their long-awaited rematch on Saturday.
Undefeated middleweight king Golovkin will climb into the ring with Alvarez at Las Vegas's T-Mobile Arena on Saturday, one year after they battled to a controversial draw at the same venue.
Prosecutors described the 38-year-old Georgian boxer as a "heavyweight enforcer" for a criminal syndicate.
The Asian Games were again marred by ugly protests at judging decisions, with two North Korean coaches removed by police and booted from the Asiad after their fighter lost a split decision.
Kazakhstan had been the dominant force four years ago in Incheon winning six titles, but they handed the baton to Uzbekistan who had boxers in all seven men's finals and took home five golds.
Taylor also won a light-middleweight bronze medal at the 2000 Sydney Olympics.
Dogboe, of Ghana, dominated Otake knocking him down twice before knocking him out after just two minutes and 18 seconds of work.
The noble art was one of six original sports in the ancient Olympics, but it faces the real prospect of being counted out by the International Olympic Committee and losing its place at Tokyo 2020.
While Munguia didn't knock Smith out, he easily won the 154-pound fight by scores of 116-111, 119-110 and 119-108.
Joshua, the reigning WBA, IBF and WBO champion, faces mandatory challenger Povetkin at Wembley on September 22.