Luizzi has been in electric form this season
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Formula One hopeful Vitantonio Liuzzi claimed the Formula 3000 title at Spa-Francorchamps in Belgium on Saturday.
The Italian, who is strongly linked with a Sauber F1 drive for next season, finished second behind team-mate Robert Doornbos.
The pair battled fiercely on the first lap in wet conditions before Doornbos took control and Liuzzi slipped back.
He held on to take second and with just one race remaining, at Monza in two weeks, he cannot now be caught.
Liuzzi, who is the final Formula 3000 champion with the series ending at the end of the current season, said: "It's great, finally we did it.
"It's very exciting. I did not believe it until I crossed the chequered flag.
"In the middle of the race other cars were catching me but I stayed calm. I had to think about the championship."