Wilson boston open

A friend told me about the Wilson Boston Open Badminton tournament at MIT this passing weekend. I thought this would be a good opportunity to practice indoor sports photography. Went there with my 17-40mm, and 100mm f2.8. The good things is I was able to move quite freely to look for good shooting spot. However, still wish I have a faster lens with big aperture. I set the shutter priority to 1/125. Iso 800, sill underexposed, although relatively sharp. I got some close up head shots with the 100mm but a lot of them are not sharp enough.The 17-40mm gave some nice wide angle pictures. wish i had brought 50mm f1.8, but I don't know whether it will be fast enough.