Ferrer never seems to get tired, and being at home in Spain, he's got that little bit of extra zip, and he seems to have found his best form in age. His short match today definitely gives him an advantage over Andy, who tends to show normal human fatigue. We can perhaps hope that Ferrer's cake for his 600th tour win will sit a bit heavy.
However, Andy has been showing masses of resolve lately, and will be incredibly motivated to make the most of this opportunity. It's likely tomorrow's winner will win the whole tournament (unless they really do exhaust each other), and an excellent chance of making WTFs without Nadal.
It's such a shame they were in the same half, because with Nadal probably out of WTFs, the runners-up placing for either of them would also give them a great chance of making it.