Re: suggest a sport lens
Canon 100mm f2 or 135mm f2 would be other suggestions. A f2.8 lens is the minimum requirement for indoor sports shooting and would pick a prime lens over a zoom.
Canon EOS 1D Mkiin & 20D + Lenses
To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.