BARCELONA (AFP) - World number one Rafael Nadal bids for a fifth consecutive title at his home Barcelona Open from Monday. The Spanish star, from the island of Mallorca, considers the city something of a second home, with his past title runs at the Real Club proving real crowd-pleasers for the Catalan public. Nadal last lost at the venue in the 2003 second round, going out to Alex Corretja, current claycourt coach of Andy Murray, the man he defeated in the Monte Carlo Masters semi-finals on Saturday. Barcelona is part of another ambitious spring schedule for the world number one, who is tuning up for his assault on a fifth straight French Open triumph at Roland Garros from May 24 by playing four out of five weeks. And despite dominating on the surface, the reigning Wimbledon, Paris and Australian Open champion warned: "I haven't played to my level on clay yet, I'm still not at my best. "So I have to improve if I want to have chances." That is considered fair warning to second-seeded compatriot Fernando Verdasco as well as returning Russian Nikolay Davydenko, the third seed, out for much of the season with a heel injury but revitalised by a Monte Carlo quarter-final. Spaniard David Ferrer and wild card Fernando Gonzalez of Chile make up the top five seeds. Russian Marat Safin, the 2000 champion, has been given a wild card as he plays what he says is his final season. He begins his campaign against Juan Monaco.