Tennis-Zverev passes Van de Zandschulp test to reach US Open semis
By Shrivathsa Sridhar NEW YORK, Sept 9 (Reuters) - Alexander Zverev took another big step towards a second Grand Slam title by beating Dutchman Botic van de Zandschulp 6-2 7-5 6-1 to reach the U.S. Open semi-finals, where the German will take on Karen Khachanov.