In the other two sets, the team followed in an even match, but in the end Isner / Sock pulled the longest straw and took home the match and three points with 2-1 in set.
Thus, John McEnroe's team leads against Björn Borgs with 8–7 where each match on Sunday gives three points and first to 13 wins.
The double meeting is followed by several singles matches in the afternoon. Among other things, Federer faces Isner while Dominic Thiem, who replaces injured Rafael Nadal, meets Nick Kyrgios.