After Alexander Zverev edged John Isner, Federer produced a fine display in a 6-3 6-2 win over Nick Kyrgios in Chicago.

Desperately needing a response, Team World got it from Kevin Anderson and the doubles team of Kyrgios and Jack Sock.

Anderson upset Novak Djokovic before Kyrgios and Sock beat Grigor Dimitrov and David Goffin in straight sets.

Those results saw Team Europe, last year's winner, finish day two with a 7-5 lead.

But with each match on Monday (AEST) worth three points, the Laver Cup remains wide open, although Team World will have Federer, Zverev and Djokovic in singles action.