Team events are having quite the resurgence on the men's tennis circuit, with three different competitions scheduled in the next four months. What's still unclear, though, is whether they can all co-exist in the long term.

"Something's got to shake out," John McEnroe acknowledged Thursday, ahead of captaining a six-man world team in the annual Laver Cup event.

The three-day Laver Cup, co-owned by and starring Roger Federer, started in 2017 while the International Tennis Federation sought a new format for the historic but ailing Davis Cup. It pits a team of European stars against a selection of players from the rest of the world.