PokerStars ambassadors Usain Bolt and Kevin Hart have teamed up to launch the online poker site's #GameOn challenge, where both stars will try to outsmart one another on social media, with fans deciding who wins each battle.

PokerStars Marketing Director Vadim Soloveychik commented 'Usain and Kevin represent two of the most popular personalities on social media, each with unique characteristics and loyal worldwide fans. It's the fast vs the funny. The gloves are off and it's about to go down. There can be only one winner and it will take a smart, shrewd, maverick mind to win this battle'.