SHANGHAI — Novak Djokovic proved his staying power on Friday night, beating an opponent 18 years his junior, 6-7 (4/7), 6-1, 6-4, to claim the last spot in the Shanghai Masters semifinals.
The 37-year-old's victory over the Czech Republic's Jakub Mensik came a day after one of his greatest rivals and contemporaries, Rafael Nadal, announced he would retire in November.
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