No, Sam did NOT have a hangover or something like this after her US Open win....
It was just Kiri who played two outstanding, fantastic matches against sam, staying focused all the time
She did not only beat sam in the last tournaments of the year, but also high class players like julia goerges, ana ivanovic, tamira paszek (all of them in straight sets) and carla suarez navarro...
ok there were two matches she should/could have won, but:
...the loss to scheepers in Guangzhou was some sort of bad luck (overrules and hindrance)
...losing to niculescu in peking wasn't that huge choke as we initially thought, considering monica's incredible run to the final later at luxembourg
I'm so glad they picked kiri for the fedcup finales, it was an excellent choice