Federer stunned by teenager Zverev in Hopman Cup

WION New Delhi, Delhi, India Published: Jan 05, 2017, 08:33 AM(IST)
Roger Federer suffered a setback on his return to competitive tennis after six months of injury layoff. Germany's 19-year-old Alexander Zverev stunned the 17-time grand slam winner at the Hopman cup. Here's more to this story.
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