Serie A pace-setters Internazionale stretched their lead at the top of the league to seven points as they ran out 2-0 winners against Siena on Saturday.
Argentinian defender Nicolas Burdisso was the unlikely scorer of the opening goal before the away team saw Mario Frick's second-half penalty saved by Julio Cesar.
Hernan Crespo then made Siena pay by doubling the lead to put the result beyond doubt.
It was Inter's 10th win in a row in all competitions and extended their unbeaten run in the top flight to 14 matches.
Roma required two penalties to fend off the stern challenge of tenacious Atalanta 2-1 in an ill-tempered clash at the Stadio Olimpico.
Just as last week against Sampdoria, captain Francesco Totti was again the two-goal hero for the Giallorossi, his cool head from the penalty spot cancelling out Riccardo Zampagna's opener for the visitors.

Crespo: scored the second goal for Inter.