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The number of tennis players forced to quarantine for two weeks ahead of the Australian Open in Melbourne has risen to 72, after another person on a charter flight to Australia tested positive for Covid-19. A member of the broadcast team became the fourth person to test positivefor the virus. New Zealand tennis player Artem Sitak is one of the players who are stuck in managed isolation, unable to train during their stay. Mani Dunlop speaks to RNZ tennis correspondent, Dave Worsley.