PULSATING FINISH: Michael Phelps wins 20th Gold Medal - WATCH

New Delhi: Michael Phelps won his 20th Olympic gold medal on Tuesday after pulverising fierce rival Chad le Clos to regain his 200m butterfly title in a grudge race bristling with emotion.

The American, the most decorated athlete in Olympic history, added to his staggering title tally by overpowering the South African in the Rio final, clocking 1min 53.36sec.

Here's the video:

This is what it looks like to win your 20th gold medal. @MichaelPhelps pic.twitter.com/lfgyqH64JJ

— Brandon Saho (@BrandonSaho) August 10, 2016