NEW YORK — Novak Djokovic’s strange US Open took another bizarre turn as he advanced to the semifinals on Tuesday when Frenchman Jo-Wilfried Tsonga retired at the start of the third set, trailing 6-3 6-2.In the women’s contest, former world No 1 Caroline Wozniacki reached the semifinals of on Tuesday with a ruthless 6-0 6-2 win over wounded Latvian Anastasija Sevastova.Tsonga took a medical timeout during the changeover at 5-2 of the second set and had the area below his left knee taped.World No 1 Djokovic held serve to love to close out the set and the Frenchman walked off, giving the Serbian passage into the last four for a 10th consecutive time.It has been an unusual tournament for Djokovic who has played only two full matches. He was given a walkover in the second round and a retirement after six games in the third before Tsonga."I’m in the semifinals, so that’s what matters for me the most," Djokovic told reporters after 83 minutes in Arthur Ashe Stadium."I know Jo for a long t...

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