Derek Bilton previews this week's ATP Tour events.
Wins too for Zverev and Medvedev.
What to expect from the ATP Cup.
Russian star refuses to be beaten.
Jo-Wilfried Tsonga off the mark in Washington.
Are younger generation 'close' to legends?
Borna Coric made to battle.
Roger Federer didn't have it all his own way.
Mixed fortunes for Kei Nishikori and Karen Khachanov.
Derek Bilton is on hand with tips from the Rotterdam, New York and Argentina events.