The Associated PressMIAMI GARDENS, Fla. — Roger Federer knew he had things going his way at the Miami Open when he hit three shots off his frame during a wild 17-stroke exchange and still won the point because Filip Krajinovic dumped a half volley into the net. Krajinovic quickly grabbed the ball and flipped it over the net as if continuing the rally, which drew cheers from the crowd and a smile from Federer. “We’re not robots,” Federer said.