At the 2008 Summer Olympics in Beijing, Sibello competed for the second straight time with Gianfranco in the 49er class. The Italian pair finished fourth in the golden fleet to lock one of the thirteen quota places available at the 2007 ISAF Worlds in Cascais, Portugal. Entered the regatta as the world's no. 2 crew, the Sibello brothers enjoyed the race series comfortably with two straight victories in the third and fourth leg and a random wave of top-five marks along the way to cement their place for the medal round. Lying in the runner-up position, they battled against the Aussies to the front under gusty conditions, until their boat capsized at the final upwind mark let the Spanish, German, and British crews overtake them. The Italians crossed the finish line in fourth and narrowly missed the podium by a slim 5-point margin, amassing 66 net points.