Novak Djokovic's two recent defeats after a 22-match winning streak offer the United States hope of seeing off Serbia in the Davis Cup quarterfinals starting on Friday.
The mere presence of the top-ranked Djokovic makes Serbia the slight favorite, but the Americans chose to play on an indoor hard-court at altitude in Boise, Idaho, to give their big servers a boost.
It's a bonus to the U.S. that Djokovic has appeared vulnerable in the past month, with two defeats in his last four matches.
However, he appears to have brushed them off this week, saying, ''I always love these seven to 10 days spending with friends just representing Serbia, it's really fantastic.''
In the other quarterfinals, Argentina hosts France, Kazakhstan welcomes the defending champion Czech Republic, and Canada faces Italy.
Djokovic recommitted to Davis Cup after skipping last year's campaign, and helped Serbia cruise past Belgium in February.
He beat Sam Querrey and John Isne...