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Andy Murray

With Roger Federer showing signs of aging and Rafael Nadal losing his grip on the top spot in men's tennis, this 24-year-old Scotsman is now a real threat to Novak Djokovic. While he only had a slightly above average 2011, we're sure Murray will come out strong at the Australian Open--where he made the finals last year.

This could be the year when he finally wins his first Grand Slam event--and if he gets started at the Australian Open, he might be able to carry that momentum into Wimbledon as well!