Julian Green of the U.S. celebrates after scoring a goal during extra time. (REUTERS/Michael Dalder)

Well, I would be lying if I said, "I really know what's going on at Wimbledon." Except for a few updates...okay, I'd still be…

Looking at the current world rankings, Nadal is 12500 pts, Djokovic is at 12330. Then there is a precipitous drop in points, with Wawrinka at 5525, Federer at 4945. Why would there be such a drop? I attribute this to the simple fact the prior two have more topspin and sidespin on their forehands.

Let's be honest here. The serve is no longer the determinant of success on tour. If it were, Raonic and Isner would be in the top five. And the other matter is that more U.S. men are neglecting what should be obvious. To win consistently above the rest of the field, one needs a versatile topspin forehand.

The men's tour used to be mesmerized by Federer and his high RPM forehand. But then Nadal came along with the capability to nearly double the RPMs at 5200. Here is…