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 on Wednesday to reach the US Open semi-finals, setting up a showdown with Karen Khachanov. Khachanov had earlier advanced when Belgian Alexander Blockx retired trailing 6-2 7-5 3-2, sending the Russian into the […]