The momentum was with now with the 28-year-old and, sensing a deciding set, the crowd came to life.
Davydenko refused to be discouraged by that setback and broke for a 4-2 lead in the deciding set.
Seventh seed Djokovic, 19, stepped up a gear at the start of the deciding set while Federer struggled with his forehand.
But Fordham, 41, won six of the next nine legs, nailing double 16 to take the match to a deciding set.
BBC: SPORT | Other Sport | World Darts 2004 | Fordham stuns Barneveld
But fellow former world No. 1 Henin dug deep to level the match and then take a 3-0 lead in the deciding set.
Teenage Dane Wozniacki came from a break down in the deciding set to beat Vania King of the United States, 5-7 6-2 6-4.
Sixth seed Clijsters trailed 5-2 and later faced match point in the deciding set against the Frenchwomen before a five-game rally transformed the semi-final.
And though Cilic twice went a break down in the deciding set, he held on to claim it 6-4 and progress to round three.
However, the Belgian dug deep and took the match to a third and deciding set after winning the tie-break, having trailed 3-0 at one stage.
BBC: Kim Clijsters beats Maria Sharapova in Cincinnati final
The Czech could not maintain that sort of form and conceded an early break in the deciding set, but still made Clijsters work hard for her win.
Henin won the first set easily but Jankovic took advantage of Henin's fragile serve to level, only for the top seed to win a tense deciding set.
The Scot comfortably held his next service game and took Federer to deuce in game nine, but he could not stop his opponent taking the match into a deciding set.
But in a see-saw deciding set, the American finally broke in the seventh game, going on to win her first match since returning to the tour after a knee injury.
Russia's Svetlana Kuznetsova battled through to a 7-6 1-6 6-2 victory over former world No. 1 Caroline Wozniacki, though both players benefited from a heat break before contesting the deciding set.
Next up for Belarus' Azarenka is Polish fifth seed Agnieszka Radwanska , who benefited from the retirement of American wildcard Jamie Hampton due to cramps in the third and deciding set of their match.
The Argentinean, who won the 14th ATP title of his career in Rotterdam recently, came close to losing the contest at 4-5 in the deciding set but battled back to take it on a tiebreak.
The match lasted more than four and a half hours, and the deciding set went for 99 minutes -- with Nalbandian furious that he was denied a video challenge at 8-8 when he held a break-point on Isner's serve.
Victory for Djokovic was revenge for a defeat to his Davis Cup teammate at the ATP World Tour Finals in London last November and he acknowledged that he was fortunate the match had not gone to a deciding set.
The fourth seed, who was bidding for back-to-back grand slam triumphs, was beaten 5-7 6-4 7-5 5-7 6-3 in the fourth round clash on Hisense Arena, running out of steam for the deciding set which Cilic took with a single break.
And the six-time champion hit top form in the deciding fifth set as Falla's fire finally died out.
Novak relied upon a single break in the deciding third set to wrap-up the match and earn his quarter-final place.
Federer, so tenacious in beating Juan Martin del Porto in a semifinal that stretched to 19-17 in the deciding third set, never found a rhythm.
Working as a salesman for Nikon, Simon tinkered at home with several gadgets, including a hearing aid for his grandmother, before deciding to set up his own shop back in 1977.
It was the 65th-ranked Baltacha's first win over a top-10 player and it came after she trailed 5-1 in the deciding third-set tiebreaker.
He received three minutes of treatment from tournament trainer Doug Spreen, then continued for another game in the second set before deciding to retire on 3-2 down.
Elsewhere in the African qualifying zone Egypt recorded a 1-0 win over Zambia in their Group C clash in Konkola to potentially set up a deciding match with Algeria in Cairo next month.
County Circuit Court Judge Jorge LaBarga is set to rule Monday, deciding whether he has authority under the law to order a new election in the county.
CNN: Republicans, Democrats clash in Palm Beach county amid recount
应用推荐