Tennis: 'Suffering' Nadal's Aussie Open in doubt with back injury

February 07, 2021 3:08 PMMELBOURNE (AFP) - Rafael Nadal admitted on Sunday (Feb 7) he had been "suffering" for 15 days with a sore back and could not guarantee he will play the Australian Open, with the injury threatening to derail his bid for a record 21st Grand Slam.