Here's what we use for Basketball, football, baseball, soccer and every other sport we cover at TriDuo:


70-200 2.8 (some use IS, some don't, i'm the latter)


28-70/24-70


24-105 (the boss hogs this lens)


300 2.8 (great for soccer, though it can over shoot on a smaller field.)


1.4 TC


17-55


17-40


Not all are used at each event, but the 70-200 and one of the mid zooms are our bread and butter. For events like Basketball, indoors and on the court, depending on your position, a prime would be more of a hindrance unless you have a zoom on a 2nd body, which it looks like you do not have. Go with a decent wide and you'll be fine. Don't limit yourself to L either, I know plenty for full time sports photogs who make kick arse shots with "cheap" equipment and 3rd party glass.