Staff Writer 
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Novak Djokovic began his latest bid for a record-breaking 25th Grand Slam singles title with a commanding win over Mackenzie McDonald.The former world number one ended his wait for his 100th ATP singles title in Geneva last week and maintained his recent upturn in form with a 6-3 6-3 6-3 win over the 98th-ranked American.Djokovic – who…
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