Description:Weeks of practice and family time have left Swiss maestro Roger Federer fit and refreshed ahead of what the 17-times major winner believes could be an unpredictable Australian Open in the absence of old foe Rafa Nadal. Federer, 31, opted to skip his usual Australian Open warm-up tournaments in the Middle East this year and instead spent it working on his game and parenting, all part of a shorter 2013 schedule that he hopes will extend his career but has left him hungry for matches.(0:51)