Too much rear wheel sliding, that was Jorge Lorenzo's only compliant after finishing fastest during Friday practice for his home Catalan MotoGP.
Lorenzo - looking to erase last year's shock last turn defeat at the hands of team-mate Valentino Rossi, with his third 2010 victory in as many weekends - was briefly disturbed from the top by Casey Stoner during the first half of the hour, but kept command thereafter.
It was close though, with the Fiat Yamaha rider just 0.153sec in front of Stoner's Ducati, and Honda's Dani Pedrosa just 0.372sec from Lorenzo in third.
"This was a good practice and I was fast straight away again, although I did think that I would be able to improve my lap time a bit more during the session,” said Lorenzo.
“Unfortunately the rear was sliding a lot which was partly to do with the heat, but we will try to improve this tomorrow.
“I love racing here, it's so close to my home and it's always extra special for me because all my family and friends come to watch. I hope I can give them a good show!"
"At the moment the problem is the rear sliding, so we need to look carefully at our setting and make some changes,” confirmed team manager Wilco Zeelenberg.
“Tomorrow we will compare Jorge's setting from last year to the one of today and see if we can make some small improvements."
Lorenzo starts round seven with a 47 point lead over Pedrosa.