Australian Open organizers are confident they will see a full slate of the world's top players, including six-time champion Roger Federer, at next year's delayed opening Grand Slam.

Tennis Australia and the Victorian state government said on Saturday the tournament had been pushed back three weeks to start on Feb. 8 after drawn-out negotiations over COVID-19 health security measures.

"We have a commitment from every player in the world to be in Australia," tournament director Craig Tiley said. "Obviously it being the start of the season anything can happen with that entry list, but the commitment is there... Every player, including Roger, have committed."