Tennis - Shanghai Masters tennis tournament - Shanghai, China - October 12, 2017 - Alexander Zverev of Germany in action against Juan Martin del Potro of Argentina. REUTERS/Aly Song
MILAN (Reuters) - Germany's Alexander Zverev says he has only played one really bad match during a sensational season.
Unfortunately it came at the U.S. Open where the 20-year-old was being widely-tipped as a potential champion.
