World number two Alexander Zverev has withdrawn from the US Open as he continues his recovery from torn ankle ligaments, tournament organisers announced on Monday.
Zverev, 25, has not played since the injury he suffered during his semi-final against Rafael Nadal at the French Open in June.
His place in the main draw of the August 29-September 11 tournament will be taken by American Stefan Kozlov.
Zverev had played in 27 consecutive Grand Slams since his 2015 debut before the injury forced him to miss Wimbledon.
He has been named in Germany's team for the group stage of the Davis Cup finals next month.
Zverev might not be the only top-10 men's player absent from the year's final Grand Slam.