Kokkinakis has been a pro for almost 7 years now and has a career high ranking of #69 with a 27-43 record on the main tour. He showed a lot of promise by making two Slam finals in the juniors, but can't seem to stay healthy. Sadly, he hasn't been able to compete regularly and the results aren't good enough to justify a big endorsement contract. That Federer win is the highlight of his career so far, and he lost his next match after that. He has the talent, but I don't think his body will ever let him play.