Of course, there is also the "injury excuse". I guess the best defence I can hope for against that is Venus beating Jennifer in the Quarters. Lindsay would also do, but of course she will not even be in the same half as Venus.
The only problem with doing that in tennis is it wouldn't be fair. You'd see too much of the same players against each other. For instance, Venus and Lindsay would probably have played each other at Wimbledon, again now at the US Open, and probably again at the Aus Open.