The dream team of Novak Djokovic and Roger Federer, who have a combined 34 Grand Slam titles between them, will pair up for Friday night's Laver Cup doubles in Chicago.
The legendary Bjorn Borg, who captain's Team Europe, made the surprise announcement just hours after Federer said he "would like" to play with the Wimbledon and US Open champion.
The opening day of action starts with an opening singles match between Team Europe's Grigor Dimitrov and Frances Tiafoe representing Team World.
They will be followed by British No 1 Kyle Edmund (Team Europe) against Jack Sock for the World side.
In the night session, David Goffin (Team Europe) will face Diego Schwartzman (Team World) followed by the blockbuster doubles clash featuring Djokovic and Federer (Team Europe) against world No 1 doubles player Sock, teaming up with Kevin Anderson.
"I did have an inkling they would play - I am surprised they would play the first day," said McEnroe, who admitted being shocked by Borg's decision to play the two top-ranked singles players, Djokovic and Federer, in the doubles.
- Each player will play at least one singles match during the first two days.
- No player will play singles more than twice during the event.
- At least four of the six players must play doubles.
- No doubles combination can be played more than once, unless for the doubles decider on Day 3, if points are tied at 12-12.
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Tennis is back on Sky Sports screens with the Laver Cup in September while we will also have coverage of the ATP Finals in November with every match live on Sky Sports.