Chung Hyeon started playing tennis after a doctor recommended that the green court might help his weak eyesight.
He is now savoring the biggest win of his career against 12-time Grand Slam winner Novak Djokovic, AFP reports.
His trademark thick white-rimmed glasses have earned him the nickname "the Professor."
He models his game on Djokovic, who is his idol, and it paid off on Monday.
Chung is the first player from South Korea to reach the last eight of a Grand Slam.
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