Mark Petchey was replaced by Brad Gilbert who was replaced by Miles MacLagan who was replaced by Alex Corretja.
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"I'm a really good fighter even if I'm not playing well, " said Corretja.
Murray has enlisted the help of two-time French Open finalist Alex Corretja to improve his all-round game on the slower surface.
The 23-year-old Scot has been working with Spaniard Alex Corretja on a temporary basis after splitting from Miles Maclagan in July.
Australian Mark Philippoussis was also upbeat after beating Spaniard Alex Corretja 5-7 6-4 7-6 on his return from a fourth knee operation.
But Corretja hung on grimly and finally edged through 6-3 4-6 3-6 7-6 (7-5) 6-2 after three hours 39 minutes on court.
But Corretja, whose agreement with Murray runs until the end of the French Open, which starts on 26 May, has no doubt that record will improve.
Spain's Alex Corretja takes on compatriot David Sanchez while second-seeded German Rainer Schuettler meets Belgian Christophe Rochus and Czech Radek Stepanek, the eighth seed, faces Swiss Michel Kratochvil.
He has won 39 straight matches on the red clay at Real Club de Tenis, his last loss coming 10 years ago to Spain's Davis Cup captain, Alex Corretja.
"I've got to give him the benefit of the doubt because I know him and I would be pretty surprised if the guy has taken something, " said Spanish veteran Alex Corretja.
Corretja, however, admits his stint with Murray in Barcelona has convinced him that one of the Scot's biggest strengths - the speed of his thought - is also a hindrance at times.
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