Querrey defeated Russian Igor Andreev 6-3 2-6 6-4 to reach his fourth semifinal this season.
There were also wins for Thiemo de Bakker, Sam Querrey, Thomaz Bellucci and Michael Berrer.
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Querrey overcame Lukasz Kubot 4-6 6-3 6-3 to secure his place in the next round.
He also coaches a handful of male players including Jack Sock, Steven Johnson and Sam Querrey.
Blake was in superb form against the 22-year-old Querrey, who is a rising star in the ranks.
It was revenge for Querrey who lost to Roddick in the semifinals in San Jose last week.
Sam Querrey lasted only 50 minutes in the fourth round and lost to Tomas Berdych, 6-1, 6-1.
Elsewhere, Sam Querrey survived an almighty scare to win his first match since becoming the U.S. No.1.
Despite the defeat, Querrey is certain to usurp John Isner as the U.S.'s top-ranked male tennis player.
Unsurprisingly, his doubles match with Sam Querrey, scheduled to take place on Court 10, had been cancelled.
Querrey will play the winner of the quarter-final between Germany's Rainer Schuettler and Israel's 14th seed Dudi Sela.
"I guess you could say it's been somewhat of the norm the last couple of years, " Querrey said.
Murray's path through the draw could potentially take in Hajek, Gilles Simon, Sam Querrey, Fernando Verdasco, Nadal and Federer.
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The Swiss will play American 20th seed Sam Querrey in the last 16.
Serbia's Novak Djokovic, the top seed, was facing American Sam Querrey for a place in the quarterfinals later Thursday.
"Yeah, he's the last person that deserves anything like that with his five or six surgeries already, " Querrey said.
The 18-year-old Krajinovic, a wildcard entry, will play American third seed Sam Querrey for a place in the Belgrade final.
American Sam Querrey booked his place in the last four following a straight sets 6-3 7-5 win over Xavier Malisse.
Querrey, who beat unseeded Russian Igor Kunitsyn 6-3 6-4, is hoping to build on his L.A. Open title last weekend.
Murray, who is going for a third successive Masters Series title, opens his campaign against American Sam Querrey on Wednesday.
The quarterfinal line-up is completed by fourth seed Tomas Berdych and Frenchman Richard Gasquet, who defeated Sam Querrey and Nicolas Almagro respectively.
Like Mr. Querrey, rising golf talent Nick Watney spent his formative years in California but has put down roots in Las Vegas.
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His fellow American Sam Querrey lost to Australia's 19-year-old rising star Bernard Tomic , who will next face Ukrainian 13th seed Alexandr Dolgopolov.
Juan Monaco beat Sam Querrey 1-6 6-2 6-3 before Horacio Zeballos secured the trophy with a 6-4 6-7 7-5 defeat of Robby Ginepri.
In the accompanying men's tournament, James Blake saw off fellow American and fifth seed Sam Querrey with a 4-6 6-3 6-4 first-round win.
In the men's event, eighth-seeded Sam Querrey upset top seed and fellow American Andy Roddick 7-5 3-6 6-1 to book reach the semifinals.
"I had a lot of break-point chances tonight which is not something I expect to happen against Andy, " Querrey told the ATP Web site.
As the fourth seed he receives a bye through to the second round, at which point he will meet Marcos Baghdatis or Sam Querrey.
Sharapova won a tight first set and then hurried along in the second, leaving Djokovic and his opponent, Sam Querrey, to take the court after midnight.
Querrey's defeat meant that an American male had failed to reach the last eight of the Miami event for the first time in the tournament's 28-year history.
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