Alexander Zverev defeated Kevin Anderson as Europe retained their Laver Cup team tennis crown here Sunday with a 13-8 victory over Team World. Zverev's 6-7 (3/7), 7-5, 10-7 win over South Africa's Anderson came with one singles rubber remaining at Chicago's United Center.

Laver Cup 2018: Team Europe retain the title

The Serbian tennis star Novak Djokovic accidentally hit his Swiss partner Roger Federer while playing Laver Cup doubles match against Jack Sock and Kevin Anderson of Team World, a match which was the talk of the town since the schedule was announced.

Awkward: Novak Djokovic accidentally hits teammate Roger Federer during Laver Cup doubles clash, watch video

Federer and Djokovic set for doubles debut in Laver Cup