Thanks!
I shoot with the original 5D, which is an awesome camera but isn't know for it's "sports" performance. To help get around that I stayed in manual exposure all day and used AI Servo mode on just the center AF spot. I left my aperture at f/8 and just had to bump the shutter speed a stop or two in either direction depending on the cloud cover. I used my 100-400L and this shot is at 400mm. I did a minor crop to change the rotation slightly. Exposure stayed at 1/800th for most of the day, as it did on this shot, at ISO 200.