An 85 f/1.8 works great when shooting near the basket--especially if the light is cruddy. A 50mm is O.K., but a little loose. A 70-200 f/2.8 is nice for floor action.
Oops--just saw that you were shooting with a crop frame camera. A plain old 50mm is a good starting point.
Canon EOS 5D Mark III
Canon EF 70-200mm f/2.8L IS II USM
Canon EF 24-70mm f/2.8L II USM
Canon EF 16-35mm f/4L IS USM
Canon EF 11-24mm F4L