Andy Murrays fantastic rise in 2012 has given tennis a new edge. Djokovic now has a rival as talented and as strong and youthful as himself to fend off, so Fed could creep up unnoticed in a lot of tournaments. When Nadal came along and usurped Federer, it wasnt long before Novak came and challenged Rafa. What happened then? Fed came back again. This could happen all over again with Djokovic and Murray, leaving Federer to rack up the wins. If Murray begins beating Djokovic like last year, a small amount of doubt begins to creep in the Serbians mind. And on any day, I think Id fancy Federer against Murray than Novak in a Grand Slam final.