Every athlete seeks that sweet spot between development and decline. But how many know exactly when that is? In ESPN The Magazine's Age Issue, stats gurus pick peak performance ages for key positions in NFL, MLB, NHL and NBA.
Gary Horton picks 48 playoff 'X factors' -- four guys per team -- who, while not household names, could swing the balance of the AFC and NFC playoffs. You'll find names like Roman Harper, John Kuhn, Raheem Brock and Danny Woodhead here.