Tough starts for Djokovic, Serena at Aus Open
Just this week, she was forced to retire in a match at the Sydney International because of a cracked toenail.
['Just', 'this', 'week,', 'she', 'was', 'forced', 'to', 'retire', 'in', 'a', 'match', 'at', 'the', 'Sydney', 'International', 'because', 'of', 'a', 'cracked', 'toenail.']