Joel Berry II could learn a thing or two from Roger Federer. Considered the greatest male tennis player of all time, At 35, Federer has learned how to conserve energy, to play the long game. There are times when opponents hit good shots to Federer's side of the court, but he lets them go. Federer will concede a point if he believes that he would waste energy on a less-than-optimal return. If he's not positioned well to continue and eventually win a point, Federer will let it go. He will often nod at his opponent and prepare for the next point.