The race to the number two seeding at the US Open could be decided tomorrow in Cincinnati.
If Murray def. Federer he is guaranteed number two seeding.
If Nadal def Federer (in the final) he is guaranteed number two seeding.
It would feel so weird if Federer and Nadal end up on the same half of the draw at the US Open. Nevertheless, whoever (out of Federer, Murray, Nadal and Djokovic) ends up with del Potro in their quarter could consider themselves very unlucky. Same goes for Roddick, but to a lessor extent.