What was a notable event at the 1990 Australian Open tennis tournament?
World number 9 John McEnroe was disqualified in his 4th round match
world number 9 john mcenroe was disqualified in his 4th round match
world number 9 john mcenroe was disqualified in his 4th round match
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World number 9 John McEnroe was disqualified in his 4th round match