strength Siena stunned Napoli 2-1 Thursday to take a decisive step towards a first ever Italian Cup final. Brazilian Reginaldo and Gaetano D'Agostino scored the goals to give Siena a semifinal, first leg victory although it may live to rue Emanuele Pesoli's late own goal. Napoli may still be favorite to progress ahead of next month's second leg in Naples but Siena can be well pleased with its night's work. The visitors played a full-strength side while the Serie A strugglers rested several first choice players. And yet they had more determination and cohesion as they put one foot in the final and a possible glamour tie against one of the country's heavyweights. Juventus won by the same score away to AC Milan in the first semifinal, first leg Wednesday. Lazio fights back Lazio pulled off a stunning second-half comeback against lowly Cesena in Serie A, recovering from two goals down to win 3-2 despite playing for nearly an hour with 10 men on Thursday. Adrian Mutu gave Cesena the lead then debutant Vincenzo Iaquinta fired home a spot kick following an incident which also saw Lazio defender Abdoulay Konko sent off. However, Lazio surged back in the second half with three goals in 10 minutes, from Hernanes, Senad Lulic and Libor Kozak. Lazio moved provisionally into third place, ahead of Udinese which faces second-placed AC Milan Saturday. Cesena remained second from bottom, four points off safety.