The mixed-gender Hopman Cup team event is set to return in 2021 after losing its traditional New Year slot on the tennis calendar, International Tennis Federation president David Haggerty said on Wednesday.

This year's 31st edition of the tournament, unique in that it is the only top-level mixed team event, saw Roger Federer lead Switzerland to the title in Perth against Germany in what fans and players feared would be a golden swansong.

Next year's inaugural ATP Cup, a new men's team competition based in Sydney, Brisbane and Perth, and offering $20 million in prize money together with ranking points, has taken the Hopman Cup's popular pre-Australian Open warm-up slot, but Haggerty insists it will return.

"Absolutely," the American, re-elected last month for a second four-year term as ITF president, said when asked if one of the organisation's flagship events still had a future.