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.
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.
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.
Murray took advantage of the lifeline with a Verdasco double-fault giving the Scot the chance to serve for the match, which he did thanks to another backhand error from the Spaniard.
Any thoughts that a straightforward win was finally on the cards were briefly put on hold as Murray handed back a break at the start of the final set with a double-fault in the following game.
Djokovic opened game five with a double-fault and, after a forehand winner from Davydenko, successive errors from the Serb handed over the break before the defending champion saw two break points go begging in the following game.
That much was clear from the very first point against Djokovic - a visibly nervous Berdych opening proceedings with a double-fault - but against Roddick he looked sharp and confident from the outset, clipping a beautiful forehand winner up the line in game one.
BBC: Tomas Berdych finds form to beat Andy Roddick in London
The Briton won the first two points of the match on the Tsonga serve and that set the tone for what followed, with Murray making the first breakthrough in game three thanks in part to a beautiful forehand winner, and in part to the Frenchman's first double-fault of the day.
Tsonga had the look of a man who knew the game was up by the time the first set had disappeared and his third double-fault of the day contributed to another dropped service game at the start of the second set, and it was the same story as he slipped 5-2 down.
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.
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.
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.
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.
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.
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.
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.
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