What is more popular online, golf or tennis?

Tennis was very popular when I was growing up. We had all the big stars like Connors, McEnroe and Borg. And the ladies were popular too, with Evert and Navratilova. Golf on the other hand was much less popular. Tennis waxed and Golf waned.

Over the last 10 years or so, courses have changed. Golf is very popular now and tennis.... not so much.

I was looking at our movers and shakers today and noticed that usopen.org was on the list. Is that golf or tennis? Turns out that usopen.org is tennis, while usopen.com is golf. Confusing huh? On a whim I plotted the two on a graph and reset the time range to "max." Guess who's more popular?

Tennis.

Turns out that for as long as we've tracked them the Tennis US Open has been more popular than the Golf US Open. Take a look at the graph. In fact, the disparity between the two has been increasing pretty dramatically over the last 4 years to the point that the usopen.org is now getting approximately 4 times the number of visitors as the usopen.com.

I really had no idea that tennis would be more popular and am at a loss to explain why. Is tennis more of a "stats" oriented sport that attracts people to the Web site? Does tennis do a better job of promoting their site to the television audience? Or is tennis just simply providing a better site?

Anybody want to take a side bet on wimbledon.org vs usopen.org? Here's the graph.