After a double fault on the first point, Li's forehand gave Azarenka the early lead.
For the second time Hingis serves a double fault while serving to close out the match.
He wasted one with a double fault and Roddick, urged on by a home crowd, saved two more.
Despite failing to close out the set at 5-3, China's most-accomplished tennis player clinched her fourth set-point opportunity on Azarenka's serve, courtesy of a double fault.
Ancic appeared refreshed after another rain delay but his second double fault came just at the wrong time, allowing Federer to break for a 6-5 lead.
Despite beginning with a double fault, Ward soon found his rhythm hitting several aces early on, but failed to back it up by breaking his opponent.
"When I made a double fault, he gave me a notice for a wrong behavior on the court as if I was throwing the match, " Davydenko said.
At 1-1, Murray, bowing to relentless pressure from the other end, threw in two errors off the ground followed by a double fault to concede the break.
Despite failing to close out the set at 5-3, China's most-accomplished tennis player clinched her fourth set-point opportunity on Ms. Azarenka's serve, courtesy of a double fault.
Chris Evert, an 18-time grand slam champion, has served love games to two fellow professionals -- Jimmy Connors and John Lloyd -- only for cupid to return a double fault.
He had to save a break point in his opening service game and it came as little surprise when he was broken at 1-2, completing a disastrous game with a double fault.
Evans's fourth double fault put Przysiezny 5-1 up, and he duly served out for the second set - but taking charge of the game seemed to break Przysiezny's concentration, and inspired a mini-Evans revival.
Under the barrage of Nadal groundstrokes errors began to creep into Djokovic's game and a double fault in the second set's opening game once more ensured the Serbian was chasing his tail as he fell 2-0 behind.
Farquharson saved an early break point in the opening game with a smash by the net and although Broady had an advantage he lost it and then served a double fault to give his opponents the early initiative.
He actually looked up at Richard Ins (the chair umpire) and was like hey, the crowd's making a noise, can I hit a first serve, and Richard told him no, and he stepped up and threw the double, double fault.
Nadal regained the dominance on serve he had enjoyed for most of the tournament as he saw out the set until he played a poor game at 2-1 down in the second, a double fault and a backhand error giving Djokovic the break to love.
Serve was again key with the Thai player hitting four aces and just one double-fault while the German had just one ace and five double-faults.
Kerber saved two set points but then produced a double-fault to give it away.
Two games later she endured one final double-fault, then hit winners on the last two points.
An emotional Safina slammed her racquet into the dirt in frustration after making her seventh double-fault of the day on match point.
Venus Williams took advantage of Cornet's double-fault to end the first set.
Almagro was serving and up 30-0 when he made a series of errors, including a double-fault that brought the score to three games apiece.
Federer let the match slip with a double-fault and four unforced errors, but played down his disappointment at missing out on the top ranking.
On the double-fault, Murray had to stop as he was about to serve to pick up a feather that had fallen on the court.
Suddenly, Baghdatis was right back in the match with a love-set and a break at the start of the fourth after a Murray double-fault.
But Federer regained his composure in the the third and broke serve in the sixth game before closing out the match on a Coria double-fault.
He may have saved one break point on his serve but the pressure seemed to mount as he dished up a double-fault to lose the game.
Federer opened the second set with a double-fault but normal service was quickly resumed and a thumping ace down the 'T' helped him take game one with little reason for concern.
Parmar saved two set points at 4-5 down in the opening set to force a tie-break and then took advantage of a costly double-fault from his opponent to take it 7-3.
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