Crowd on the Field

A young soccer player navigates the traffic on the field.
 
I nearly always use the center AF point (only) when shooting sports. The center focus point is typically the most accurate for tracking fast action. However, the center of the frame is not always where you want the point of focus to be. This along with the use of a prime lens from a fixed position (sidelines) means that cropping is frequently needed during post processing. This picture is an example of everything coming together properly for a non-cropped final image.