
Alexander Zverev beat Roger Federer in straight sets to win the Rogers Cup in Montreal on Sunday. Paul Chiasson / AP Photo
Alexander Zverev beat Roger Federer in straight sets to win the Rogers Cup in Montreal on Sunday. Paul Chiasson / AP Photo
Federer lauds Zverev as player to watch after being stunned in Montreal Masters final
'He's taking everything not just to the next level, but the two next levels,' Federer says of 20-year-old German.