Errani, who is ranked 23rd in the world, showed plenty of grit to save two set points in the eighth game, but when a third set point came up in the following game Sharapova ruthlessly converted.
After saving a set point in game 10 of the second set, Soderling then picked up four break points in the next game -- taking one to go 6-5 up when Gonzalez slammed a forehand wide.
The third set progressed at a rapid pace with the tension ratcheting up a notch as each game passed, and Federer had the first chance but could not capitalise on a set point in game 10.
Hs patient baseline game helped earn him the first set point at 5-4, only for Gulbis to fire a huge ace out wide.
Li survived a set point in the ninth game before holding, then broke Williams' serve in the next game on the way to forcing a tense tiebreak.
Ferrer won 6-2 3-6 3-6 6-3 6-4 despite a mid-match slump and facing a break point in game six of the fifth set.
Stoke dominated but the Baggies looked set for a point from a dreadful game until Sidibe headed in Danny Higginbotham's left-wing cross.
Lopez weathered five break points in the eighth game of the first set and also saved a set point, but was unable to take his chance in the tie-break.
Murray had not dropped a set en route to the quarter-finals but, having saved one break point in the fourth game, he was broken by Ljubicic in the sixth before the Croatian sealed the set with his sixth ace.
She then wasted another set point on her own serve before losing the game to go to 5-5.
The Londoner gathered herself at the start of the second set and kept pace until game five, at which point a difficult task became all but impossible as Pennetta broke serve once again.
The turning point came when Sharapova broke Haynes in the sixth game of the second set to go up 4-2.
Chela improved in the second set and he broke Murray in the sixth game, but by that point the Scot was two breaks up which proved too much to claw back.
The Russian's ability to serve out the set was not fully tested when, at 5-3, Djokovic double-faulted on the first point of a game for the second time, soon found himself two set points down, and then watched as a Davydenko sliced return floated past him into the corner.
Davydenko then saved a set point before coming from 0-30 down in his next service game to take the set into a tie-break.
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.
Murray seemed rejuvenated from his three-week break as his service game was almost flawless, with the British number one dropping just one point in the first set.
The second set was tighter, with Del Potro having a break point in the sixth game.
The opening game of the second set lasted 12 minutes before Murray finally won it on his fifth break point, only to hand the break straight back within moments in a woeful game.
Federer came out in blistering form as he dominated the opening set, dropping just two points on serve and converting his fourth break point in game eight as he swept through it in 32 minutes.
Murray admitted afterwards that a mammoth 53-shot rally in game three of the second set, which ended with Benneteau missing a smash, had been the turning point.
In the West Region semifinals, Arizona coach Sean Miller got extra time to set up a play after officials stopped the game to check the time on a 3-point shot by Ohio State's LaQuinton Ross.
In the second set, Clijsters gained an early break, saw off a break point in the fifth game to hold for a 4-1 lead, and she fought back from 0-40 down to serve out the match.
The initiative looked set to change hands again, but in the next game Clijsters somehow managed to conjure another break point, which she converted with a brilliant improvised lob.
She broke the Croatian's serve again in the third game of the second set before wrapping up the match when Kostanic sent a forehand long on the first match point.
Despite losing the set, the Poles continued to look the stronger pairing and Murray had to save a break point early in the third set before the world number three was broken in the sixth game.
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