Novak Djokovic believes he still has something to prove every time he steps on court as he reached the US Open third round for a record-equalling 19th time on Wednesday. 

The 38-year-old Djokovic battled past American qualifier Zachary Svajda in four sets to stay in the hunt for an unprecedented 25th Grand Slam singles title. 

“One can always think that there is nothing more to achieve or to prove because you’ve done it all, but it’s quite relative to each person. I see it differently” said Djokovic.