NEW YORK (AFP) - Tokyo Olympic champion Alexander Zverev advanced to the US Open semi-finals on Wednesday (Sept 8), moving into Novak Djokovic's path as the world number one chases a calendar Grand Slam.

German fourth seed Zverev stretched his win streak to 16 matches by defeating South Africa's 46th-ranked Lloyd Harris 7-6 (8/6), 6-3, 6-4.