Alexandre Pato scored twice, thanks to Ronaldinho's deft assists, to hand AC Milan a hard-fought 2-1 win at Siena in their Serie A opening game on Saturday. Fit-again playmaker Ronaldinho was instrumental in midfield, as he set up his Brazilian countryman Pato twice with aplomb. The game was the first real test for Leonardo as a head coach, following his appointment at San Siro this summer. Pato notched the opener on 29 minutes, and Abdelkader Ghezzal brought the score level five minutes after. But Pato netted the winner on 48 minutes and the Rossoneri hold onto their slender lead till the final whistle. Former Barcelona superstar Ronaldinho, whose last season with Milan was below-average, put in one of his finest performances to prove that he's able to fill the gap left by the departure of Kaka.