LONDON (Reuters) - Alexander Zverev's long-predicted arrival at the summit of men's tennis is taking too long for some impatient observers but he took another significant step forward by beating John Isner to reach the last four at the ATP Finals on Friday.
His 7-6(5) 6-3 victory over the American meant the 21-year-old became the first German since Rainer Schuettler in 2003 to reach the semi-finals of the prestigious year-ending tournament and the youngest since Argentine Juan Martin del Potro in 2009.
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