Michael Phelps wins 200-meter butterfly for his 20th Olympic gold medal

RIO - Michael Phelps made up for one of the few losses in his Olympic career.
    
Now, he's got an even 20 gold medals.
    
Phelps avenged his defeat at the 2012 London Games by winning the 200-meter butterfly on Tuesday night, holding off Japan's Masato Sakai by a mere four-hundredths of a second.
    
The victory clearly delighted Phelps, who held up one finger, then sat on a lane rope and egged on the roaring c