He was apprehended in the city of Granollers, 20 miles (35km) north of Barcelona.
He will face either Italian third seed Andreas Seppi or Spanish No. 8 Marcel Granollers.
Team captain Emilio Sanchez Vicario called up world number 56 Marcel Granollers to replace Nadal on Tuesday.
The fourth seed will next play Uruguayan eight seed Pablo Cuevas, who overcame Spanish qualifier Marcel Granollers 7-6 (10-8) 7-6 (7-2).
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.
Anna Romaguera, 29, is a psychiatrist in the Catalan town of Granollers.
Frenchman Benoit Paire beat Marcel Granollers 6-1, 6-0 to advance to his first Masters semifinal and will face Roger Federer in the last four.
Spain can book a place in the final if Marcel Granollers and Marc Lopez can upset world No.1 doubles pair, Bob and Mike Bryan.
After losing the opening set, Oliver Marach and Alexander Peya produced a fine comeback to overcome Marcel Granollers and Marc Lopez 3-6 6-4 6-4 7-6.
After Granollers won the first set 6-3, Murray took a long injury break early in the second set, getting his left thigh and lower back massaged.
The Spaniard thrashed Russian 27th seed Mikhail Youzhny 6-0 6-2 6-2 to set up a clash with compatriot Marcel Granollers, who beat a tired Paul-Henri Mathieu.
But fourth seed Nicolas Almagro was able to progress beating Spanish compatriot Marcel Granollers 6-3 6-4, while Argentine Juan Monaco, seeded seven, dismissed French tenth seed Jeremy Chardy 6-0 7-6.
Tomas Berdych, the No. 4 seed from the Czech Republic, beat Spain's Marcel Granollers 7-5 6-4 while No. 9 seed Marian Cilic saw off South Africa's Kevin Anderson 6-2 6-3.
"I'd be very surprised if I was playing in Paris, " the British star, who lost in the quarterfinals in Madrid last week, told reporters following his match against Spain's Marcel Granollers.
Spanish 26th seed Marcel Granollers will play Tsonga or Mello if he defeats Portugal's Frederico Gil, while Argentina's world No. 29 Juan Ignacio Chela could face Ferrer if he gets past Spain's Pablo Andujar.
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In the semifinals, they beat the Spanish duo of Marcel Granollers and Marc Lopez that could face the Bryans in the Spain-U.S. Davis Cup tie in September, which likely will be held on red clay.
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