Ciro Immobile continued his rich vein of scoring form with two goals in Lazio's 4-1 Serie A victory against Cagliari.Italy striker Immobile made it eight goals in his last six games for club and country as Lazio swept into a three-goal lead inside 28 minutes.Balde Keita drilled Lazio ahead six minutes in before Immobile struck from the penalty spot midway through the half, and then swept home a loose ball five minutes later.Calgliari spurned a chance to get back in the contest when Marco Borriello sent his penalty on the hour wide of a post.Felipe Anderson added a fourth for Lazio after 79 minutes before Wallace's late own goal offered Calgliari some consolation.