Romania's Simona Halep became the first seed to be bundled out of the Australian Open on Monday when she was beaten 6-3, 6-1 by USA’s Shelby Rogers.
Halep, seeded fourth, also crashed out in the first round at the season-opening grand slam last year.
The 25-year-old sought medical advice after the first set but was able to continue in the second though she appeared to be favouring her left knee, flexing it throughout the match.
Rogers, who beat former top-10 player Eugenie Bouchard two weeks ago in Brisbane, sealed victory in 75 minutes when Halep hit a backhand into the net in the Rod Laver Arena.
(With inputs from Reuters)
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