I regularly shoot in sports halls and use 2.8 lenses, but even then it can be a problem on two counts, 2.8 can be too wide depending on what you want in focus, being able to get up to f4 can be helpful especially if its a fast moving sport and on you and yours cameras ability to stay on focus on a moving object, but more significant is high ISO capability, you normally need to pushing up into the 1000+ range, so again that can come down to your camera and pp skills.