Djokovic, Monfils, Kerber And Wozniacki Advance Into Semis
Top seed Novak Djokovic advanced to the semi-finals of the u.s. Open as Frenchman Jo-Wilfried Tsonga retired at the start of the third set of their quarter-.trailing
Djokovic held serve at love to close out the set for a 6-3 6-2 lead but the Frenchman walked off to give the Serbian passage into the U.S. Open last four.
Djokovic faces France's 10th seed Gael Monfils, in the semi-final, who trounced
Compatriot Lucas Pouille in straight sets.
In the women's draw, second seed Angelique Kerber made it to the semi-finals bringing Roberta Vinci's flushing meadows dream run to an end with a clinical 7-5 6-0 win.
She will now face Denmark's former world number one, Caroline Wozniacki.
The Dane eased into the last four with a ruthless 6-0 6-2 win over wounded Latvian Anastasija Sevastova.
With her opponent hobbled, Wozniacki showed no mercy and moved in for the kill, keeping Sevastova running from sideline to sideline.