Sports Saga keeps you up to date with all the latest news and scores at the US Open day four of the US Open is already upon us and the two defending Champions have continued their progress in New York overnight Novak jokovic was leading llo Jerry 6 of4 642 Nero when an abdominal issue forced his compatriot to retire Coco go also sailed through beating Germany's tachana Maria 6 n6 Nero but there was heartbreak for britan Harriet Dart host to Ukraine in 19th seed Marta kostuk the British number three aiming to reach the third round for the first time in her career was way below her best as a series of unforced Errors signified her 7-6 1210 6 to1 defeat in sweltering heat the 28-year-old cut a disconsolate figure afterwards the last three remaining British singles players Katie Bolter Jack Draper and Dan Evans are all in action today with play starting at 4 p.m. UK time Katie Bolter takes on Spanish world number 74 Jessica bu's Monero in the second match Jack Draper then faces Argentine world number 64 fundo Diaz aosta and FF winning the longest match in US Open history in the first round Dan Evans will then play the last match of the day against Argentine world number 36 Mariano Navone the two top seeds meanwhile janx Sinner and IGA swatek are also playing in the day session in the Arthur Ash Stadium and