Originally Posted by mike_d
The 70-200 - yes, the 70-300 - no. You said this is for sports, so you need the fastest lens you can get = wide max. aperture.
The 70-200 has constant f/4 aperture while the 70-300 at the long end is only f/5.6 - that is one stop slower than the 70-200... which equals to TWICE less light!