Huber would have been dead tired not only from her first match but the super hot conditions as well. Her women's doubles match lasted about 3 hours and went to a 3rd set tiebreak. The first set ended in a tiebreak as well.
BTW, her women's doubles match was one the the best doubles matches I have ever seen. Black/Huber lost that one but they had several match points and the game could have gone either way.
Disappointing to see them lose, but after the long match that Huber had its probably not too surprising as she must have not had a lot left in the tank.
Hopefully Jamie can recover from this and have a good week next week.