Great Sportsmen

What do the greatest sportsmen/women have in common? Don Bradman, Roger Federer, Tiger Woods, Paula Radcliffe, Sebastien Chabal, Ellen MacArthur? They all say that they are calm when they compete. I think this must be so, and I can see how driving all one's emotion into perfecting one's own performance would give one a huge advantage over an opponent who wastes emotional energy in ranting against cruel fate. There is an important lesson here.