The No. 6 seed Jo-Wilfried Tsonga, from France, triumphed 7-6 6-2 over Russia's Nikolay Davydenko.
Wawrinka replaced Jo-Wilfried Tsonga in the field after the Frenchman pulled out with a wrist injury.
Spain's Feliciano Lopez will play third seed Jo-Wilfried Tsonga of France in the other semifinal Saturday.
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Jo-Wilfried Tsonga, seeded seventh, came from a set down to defeat Spain's Fernando Verdasco 4-6 6-3 6-2.
Elsewhere, French eighth seed Jo-Wilfried Tsonga suffered a shock defeat by Jerzy Janowicz, going down 6-4 7-6.
His opponent Wednesday will be No. 9 Marin Cilic, who defeated No. 6 Jo-Wilfried Tsonga 7-5, 7-6 (4).
Murray also made it through to the last four in London, beating Frenchman Jo-Wilfried Tsonga 6-2 7-6 (7-3).
Nadal will now meet Gilles Simon after he won his all French clash with Jo-Wilfried Tsonga 7-5 6-4.
French eighth seed Jo-Wilfried Tsonga came through a titanic battle with unfancied German Daniel Brands on Court Phillippe Chatrier.
Nadal will now face France's Jo-Wilfried Tsonga, who saw off Stanislas Wawrinka 2-6 6-3 6-4 in his quarterfinal tie.
There were also wins for France's Jo-Wilfried Tsonga, Italy's Andreas Seppi, Belgium's David Goffin and eighth seed Richard Gasquet.
Fifth seed Murray will now play either world number one Roger Federer or Jo-Wilfried Tsonga of France in Sunday's final.
Nadal will now face compatriot and ninth seed Juan Carlos Ferrero, who saw off fifth seed Jo-Wilfried Tsonga 6-1 3-6 7-5.
Blake will next face France's Jo-Wilfried Tsonga, who beat Andy Roddick 5-7 6-4 7-6 (7-5) in the evening match in Paris.
France's hopes of a first men's champion in 30 years remained on course with further victories for Jo-Wilfried Tsonga and Gael Monfils.
France's Jo-Wilfried Tsonga, who suffered an injury scare when he injured a finger at the Aegon Championships, is seeded fifth for Wimbledon.
The Slovakian, who accounted for Jo-Wilfried Tsonga in the previous round, beat his doubles partner Jeremy Chardy of France 6-4 6-4 6-4.
On the men's ATP World Tour, sixth-ranked Tomas Berdych will play No. 8 Jo-Wilfried Tsonga in Sunday's final of the Marseille Open.
John Isner can seal America's place in the semi-finals if he beats the French No.1 Jo-Wilfried Tsonga in the first singles rubber.
Seventh seed Jo-Wilfried Tsonga also advanced, beating Germany's Rainer Schuettler 4-6, 6-3, 6-4 to set up an all-French quarter-final against Gilles Simon.
France's Jo-Wilfried Tsonga will meet Tomas Berdych, from the Czech Republic, in the last eight after he beat Marcos Baghdatis 6-2 7-6.
France's Jo-Wilfried Tsonga gave the hosts the initiative with a four-set 7-5 6-2 2-6 6-2 win over Ryan Harrison in the opening rubber.
Nicolas Almagro will take on Jo-Wilfried Tsonga in the third round after he overcame fellow Spaniard Albert Ramos 7-6 (7-1) 6-7 (4-7) 6-3.
Cilic was joined in round three by French fifth seed Jo-Wilfried Tsonga and Spanish sixth seed Fernando Verdasco, who both recorded straight-sets victories.
Next up for six-time grand slam champion Djokovic is France's Jo-Wilfried Tsonga, who came from one set down to beat Canadian Milos Raonic.
And Djokovic's finals appearance was already made possible, don't forget, by his salvaging four match points in a five-set quarterfinal versus Jo-Wilfried Tsonga.
Wawrinka, meanwhile, will next face world No. 8 Jo-Wilfried Tsonga, who defeated Austrian Jurgen Melzer 6-3 6-0 the day after the Frenchman's 28th birthday.
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He will play either Jo-Wilfried Tsonga or Stanislas Wawrinka in the quarterfinals (their match was suspended for darkness Sunday evening in the fifth set).
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Ferrer will now face seventh seed Jo-Wilfried Tsonga for a place in the semifinals, after the Frenchman saw off Colombian qualifier Santiago Giraldo 6-3 6-4.
World number one Roger Federer faces Russian Nikolay Davydenko in tomorrow's other quarterfinal while Novak Djokovic of Serbia will take on Jo-Wilfried Tsonga of France.
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