Atlanta Varsity Basketball Game

second time shooting a varsity basketball game. I used on camera flash due to lack of gear, lighting would have been alot better if off camera flash was used. Alot of my pictures were shot a stop under correct exposure. I uped the exposure in lightroom which caused the graininess. I had to constantly alter my AWB.
My settings were ISO 1250, 68mm, f 4.0, 1/200 sec.