Jorge Lorenzo remained cautious despite setting the fastest time on the opening day of practice for the Italian round of the FIM MotoGP World Championship at Mugello.
The Fiat Yamaha rider, who leads the championship points standings, edged out team-mate Valentino Rossi in front of the Italian's home fans.
But Spaniard Lorenzo was not taking anything for granted ahead of Sunday's race.
He said: "This is a great start but it's too soon to speak about the race or jump to conclusions; we've only had one practice.
"It's true however that I didn't have any problems today and I felt very happy for the whole session.
"Each time we come to a new track we don't know exactly what to expect because we're still learning the new Bridgestone tyres but at the moment we seem to be fast each time and I feel very comfortable in this period; this is positive.
"It's very hot here, even hotter than in Spain but I am okay with that because we've had too much rain and we all need some sunshine. I hope it will continue like this for the weekend because it's better for everyone."