#Phelpsface: Michael Phelps’ game face at Rio 2016 becomes online sensation

American swimmer Michael Phelps has been one of the biggest attractions at the Rio 2016 Olympics thanks to his 20th career gold medal, but on Tuesday, he was in the news for a different reason.

American swimmer Michael Phelps has been one of the biggest attractions at the Rio 2016 Olympics thanks to his 20th career gold medal, but on Tuesday, he was in the news for a whole different reason.

USA's Michael Phelps competes in the Men's 200m Butterfly Semifinal during the swimming event. (AFP Photo)

The most successful, and possibly the most scrutinized, Olympian in history, was caught making a grimly determined face as he prepped Monday for his semifinal in the 200-meter butterfly and his expression became an instant online phenomenon..

Here’s a look at some of the tweets regarding Phelps’ menacing expression -

In an interview with NBC after his event, Phelps claimed he had been thinking about “nothing”.