After opening a two-set lead, Monfils saw world number 12 Ferrer claw his way back to two sets apiece.
"She's a tough opponent but I've had two straight, two-set matches that I won and I'm very confident, " said Petrova.
Eighth seed Soderling blew a two-set lead as he crashed out, losing 5-7 2-6 6-4 6-4 6-2 to young Spaniard Marcel Granollers.
And true to form, the Swiss dominated from the very first game as he raced to a two-set lead within the hour.
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The Chilean, 26, put up more of battle in the second, but Murray got the vital break at 2-1 on his way to a two-set lead.
Murray served for a two-set lead at one stage but fortunes shifted wildly as erratic form and injury problems saw both men take and lose the initiative.
Murray's only previous match against Nalbandian came at Wimbledon in 2005, when the Scot - aged 18 - surrendered a two-set lead in his first outing on Centre Court.
When Murray broke for the fifth time in the match on his way to a two-set lead it seemed a comfortable passage into round four was on the cards.
He was broken again in the fourth game of the second set and soon had to watch Djokovic dish up a pair of aces to open up a two-set advantage.
"Considering the way he served in the first two sets, I was glad to get through with a two-set lead, " said the 26-year-old, who has dropped a set in each of his three matches this year.
Serving for a two-set lead at 5-4, Falla faltered for the first time, but Federer was unable to take advantage, two break points slipping by before the Colombian forced his opponent off court and put away an easy volley on his fourth set point.
Joining me on the sweeping two-story set is a village-size cast including half a dozen dancing brides niftily accessorized with dancing grooms, quick-stepping waiters, acrobatically inclined construction workers, happy townies, multiculti mariachis, and (putting us indisputably over the top) a marching band.
Their two-hour set opened with Good Times Bad Times - the first track of their debut album.
The fact that he was blaming it on the set-up was probably further illustration - for actually he had already shown in the third practice session and the first two qualifying sessions that there was very little difference between the single-lap potential of the two set-ups.
There is a new two-CD set of previously unreleased music, and David Greenberger has a review.
Proceeds from the two-disc set will go to shore up the musical life of Domino's beloved New Orleans.
Harmon last month put out a two-DVD set, "Butch Harmon: About Golf, " that encompasses the whole of his teachings.
He gave the two-volume set, including documents sent by Cope claiming members could earn returns tax free, to a pair of IRS agents.
The two-disc set available for purchase also includes a digital copy of the film and will be enabled with UltraViolet, a new way to collect, access and enjoy movies.
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Even the many live records, including this two-disc set, are only intermittently great: Booker was prone to effusive showboating, and because he could dazzle on autopilot, that's often how he rolled when performing.
On Tuesday, the rare material will finally be released on "Bill Evans Live at Art D'Lugoff's Top of the Gate" (Resonance) a two-CD set that rivals Evans's revered Village Vanguard recordings for Riverside in June '61.
These are alternated by two similarly-set diamond flowerheads, each mounted with a brilliant-cut diamond weighing 2.02 and 2.01 cts. to the marquise-cut diamond petals, interspersed by connecting links of pear-shaped fancy vivid and fancy intense diamonds of yellow and orange hues and diamonds of foliate motif.
Asamoah Gyan regained the lead for Sunderland after the break, but the visitors sat back and finally buckled under a barrage of long throws and set-pieces, as two Jermaine Pennant free-kicks set up Huth to score twice in the last seven minutes and seal a remarkable recovery.
"We've got to look at the way players have played individually within the two set-ups and with the exiled players, " he said.
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According to music retailer HMV, the album is outselling the current number one, Westlife's Face to Face, by a margin of two-to-one and looks set to top the chart on Sunday.
That is unless the two front-runners set aside their rivalry and decide to govern together, each bringing his or her allies into the coalition tent and all combining to keep Mr Lieberman out.
It wasn't flattering, we came to do a job, prepared really well, we got two set-piece goals in the first half but knew if we came and closed them down we would get our just rewards.
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.
But 30-year-old Llodra took control at the net to claim the next two sets before two straight aces in the fourth-set tie-breaker helped him put France 2-0 up and loosen Spain's two-year grip on the cup.
Prince has played his first UK festival, with a two-and-a-quarter-hour set at the Hop Farm Festival.
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