Five best players at the 2019 Laver Cup

#2 Jack Sock (Team World)

Jack Sock

Following a devastating season and a half that saw his ranking plummet from No 8 at the start of 2018 to No 210, Jack Sock arrived at his third Laver Cup hoping to rekindle his form at a tournament that has been kind to him in the past.

Facing Monte Carlo champion Fabio Fognini in the second match of the first day of action in Geneva, Sock belied his lowly singles rank to stun the Italian in straight sets. The win helped level the tie at a point apiece for Team World.

Sock teamed up with Shapovalov for the fourth match of the day against Team Europe's Roger Federer and Sascha Zverev. It was Sock's seventh doubles match at the Laver Cup. The Nebraska native had featured in all of Team World's doubles ties at the two previous editions of the competition, with an impressive 5-1 record.

But it was Federer and Zverev who recovered from an early break to take the opening set 6-4 and survived multiple set points in the second set to close out a hard-fought 6-4, 7-5 win in the longest doubles match in Laver Cup history.

Kyrgios (left) and Sock rejoice after their win over Nadal and Tsitsipas

Sock was in action on the second day when he teamed up with friend Nick Kyrgios in the last match of the day against Rafael Nadal and Stefanos Tsitsipas. Team World took the opening set 6-4 and looked on course for a straight-sets win but Nadal and Tsitsipas took the second set 6-3 to force a third set. Team World though were good enough to win the tiebreak 10-6, to reduce their deficit to 5-7 at the end of the second day.

The American was in the spotlight on the third day as well when he teamed up with compatriot John Isner to deliver a 5-7, 6-4 (10-8) win to push Team World into the lead for the first time in the tie (8-7). The win made Sock the first player to win eight matches at the competition (7-1 in doubles, 1-2 in singles).