The fourth edition of the Laver Cup exhibition event founded by Roger Federer’s management company is postponed for a year because of changes to the tennis calendar caused by the coronavirus pandemic.

It now will be at TD Garden in Boston from Sept. 24-26, 2021.

The original dates were Sept. 25-27 this year. But the French Open moved its start from May to Sept. 20 a month ago, meaning the Grand Slam tournament would have overlapped with the Laver Cup.

Federer called the announcement of the Laver Cup date change “unfortunate” and “disappointing” but also “the right thing to do for everyone concerned.”

The exhibition tournament has attracted some of the top players in men’s tennis in the past.

Tickets already purchased will be valid in 2021 or can be refunded.