How would the camera know what to track?
I don't think auto tracking would even know what to do during a tennis match, small ball, two players moving about and even if it knew to track the ball, I'd think it would wear out the motor trying to catch up.
Then if you talk soccer, two teams moving about. Too many objects at once. Maybe camera could do a bit of a left half, center, right half of the field, but it may be to slow & jerky to watch and still miss important moments.
I think you could setup one or more static cams and have multiple viewers, or setup an additional webcam. Then have viewing accounts directly or through a streaming service
ustream.tv comes to mind, but it seems like they don't have free/basic accounts
livestream might work