Novak Djokovic has reached the third round for the 33rd successive time without hitting a ball when his scheduled opponent pulled out with an injury in US open. World number one Djokovic was handed a walkover when Jiri Vesely of the Czech Republic withdrew from their second round encounter suffering an inflammation of the left forearm. Vesely's misfortune was a welcome boost for Djokovic who had required treatment on his upper right arm in his laboured first round win over Jerzy Janowicz on Monday. Djokovic will face either Guido Pella of Argentina or Mikhail Youzhny of Russia on Friday for a place in the last 16. British 13th seed Johanna Konta has reached in the third round of U.S.Open defeating Tsvetana Pironkova of Bulgaria 6-2, 5-7, 6-2 in New York today. Konta was leading by a set but serving at set-point down in the second when she suddenly dropped to her knees, shaking and struggling to catch her breath as temperatures neared 88 degrees Fahrenheit. Roberta Vinci, the 2015 runner-up, and two-time Wimbledon champion Petra Kvitova both also booked third round spots. Seventh seeded Italian Vinci, defeated by compatriot Flavia Pennetta in last year's final, eased past Christina McHale of the United States 6-1, 6-3. The 33-year-old, playing at Flushing Meadows for the 14th time, goes on to face either Yulia Putintseva of Kazakhstan or Germany's Carina Witthoeft.Kvitova, the 14th seeded Czech beat Turkey's Cagla Buyukakcay 7-6, 6-3. Up next for Kvitova is Ukrainian 22nd seed Elina Svitolina who put out Lauren Davis of the United States 6-1, 4-6, 6-3. Early winners in the men's event were South Africa's Kevin Anderson who saw off Canada's Vasek Pospisil 7-6 (7/3), 6-4, 6-4. Britain's Kyle Edmund backed up his first round win over world number 15 Richard Gasquet with a 7-5, 6-4, 6-4 victory over US wildcard Ernesto Escobedo.Seppi, ranked at 87, has never got beyond the third round in New York but he is a former Reigning Roland Garros champion and third seed Garbine Muguruza of Spain tackles Latvia's Anastasija Sevastova. Muguruza needed three sets to see off Belgian qualifier Elise Mertens in a first round tie which also saw her need a medical timeout after suffering heat exhaustion. Angelique Kerber, the second seeded Australian Open champion who could depose Serena Williams as world number one, faces 34-year-old Mirjana Lucic-Baroni.