Dominic Thiem has stormed into the semi-finals of the ATP Finals.
He's become the first player to qualify for the final four after upsetting Novak Djokovic in three sets.
Meanwhile, seven-time Dubai Duty Free Tennis Championships winner Roger Federer returned to winning ways with a straight-sets win over Matteo Berrettini.
That means he'll now take on Djokovic for a spot in the semi-finals.


Schaper wins back-to-back DP World Tour titles
Asian Football Confederation to launch Nations League competition
Australia crush England fightback to retain Ashes
Desert Vipers cruise past Sharjah Warriorz to strengthen table-top push
