A young, warmly-dressed soccer player appears to have the ball on the wrong side of her in this picture.
My Canon EOS 1D X's Custom Mode 1 is set to f/2.8 (automatically goes to f/4 with this lens), 1/1600, Auto ISO and AI Servo with high speed frame rate. When I'm shooting action with a long lens, I simply select Custom Mode 1 and I'm ready to shoot. If the lighting is constant (typically a clear sky), I will sometimes select a specific ISO value to use.
Camera and Lens Settings
600mm f/4.0 1/1600s
3157 x 4736px