Bodo: What explains Djokovic's surprise coaching split?
The world No. 1 has made major chances in the past to great success, but at 36, who or what can help Djokovic fend off perhaps his greatest rival yet: Father Time?
8 Tournaments in Play
See Live ScoresThe former No. 3 flies into his first semifinal at the Hard Rock Stadium.
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No. 1 marked the start of a new rivalry—and a new era for tennis.
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