Milan 1 - 1 Sampdoria
Shevchenko pen 13 (M), Gasbarroni 35 (S)
Stadio Giuseppe Meazza
Sampdoria have put another spanner in the works for Milan after holding them to a 1-1 draw at San Siro.
The Rossoneri's first defeat of the season was 2-1 at Marassi in Week 3, so they were out for revenge and needed a win to stay in the Scudetto race. They were also chasing their 11th consecutive home victory and welcomed back Jaap Stam and Marcos Cafu from injury, even if the Brazilian was not ready to start. Sampdoria had Fabio Bazzani in the side, though ex-Milan midfielder Sam Dalla Bona was suspended.
There were doubts over whether this game would go ahead due to heavy snowfall in the Milan area, but the covers over the San Siro pitch and a change in the weather safeguarded the football. Dida had to undergo a late fitness test after suffering a back problem during the warm-up, but he was able to start.
Instead, it was Sampdoria who were forced into a substitution after less than five minutes, as Bazzani's knee injury flared up again and he made way for ex-Rossoneri striker Vitali Kutuzov.
Pippo Inzaghi sprung the offside trap and turned Andrea Pirlo's searching pass round the post with a diving header. Francesco Antonioli passed his clearance straight to Clarence Seedorf, but Sergio Volpi was able to clear the danger.
Referee Massimo De Santis pointed to the spot after 12 minutes when Volpi clattered into the back of Inzaghi as he tried to get on to Serginho's deflected cross. It was certainly a clumsy challenge that brought down the forward and Andriy Shevchenko stepped up to sidefoot his penalty into the net.
Aimo Diana's timid effort was comfortably held, while at the other end Serginho combined with a delightful Seedorf backheel and Antonioli smothered the cross before it could reach Inzaghi.
Kutuzov had a great chance when he broke the offside trap, but Jaap Stam flung himself at the ball to charge down his shot from eight yards.
Sampdoria were furious on the half-hour mark when Andrea Gasbarroni fell in the penalty area, but the linesman flagged for a push on Gennaro Gattuso. Gattuso slipped and stuck out an arm, seeming to trip the winger, but the decision went in the Milan man's favour.
Gasbarroni took revenge a couple of minutes later by scoring Sampdoria's equaliser. The former Under-21 international unleashed a powerful snapshot from distance that took a slight deflection off Nesta's shin to push the ball just past Dida. Nonetheless, the ball didn't seem to move too much through the air, so it should be put down as a howler from the Brazilian goalkeeper. This was the first goal Milan had conceded after three consecutive clean sheets in all competition.
Dida almost let in another goal soon after, as he was completely motionless when Volpi's free kick slammed the upright to his left.
Incredibly, Sampdoria hit the woodwork for a second time a handful of seconds later. Marcello Castellini rose to nod a corner kick on to the other upright.
Milan were struggling badly towards the end of the first half and another Castellini effort whistled just wide of the target.
Samp continued to impress after the restart and Dida found it tough to get a deflected Palombo effort under control. The home side couldn't find a way through and introduced Alberto Gilardino in place of Inzaghi.
Within moments of coming on, Gila had threatened on an Antonioli fumble from Stam's cross, then Shevchenko's volley was just wide of the near post.
Antonioli was decisive soon after when he was at full stretch to parry a fierce Shevchenko strike from the edge of the box.
The former Milan goalkeeper certainly felt Kaka's missile a minute later, as it nearly pushed him back into the net through sheer force. Gilardino also nodded over the bar as suddenly Sampdoria were under siege.
Pirlo drilled over the bar and Ancelotti introduced Cafu, who has been out of action for a couple of months due to injury and compassionate leave.
At the other end, Zenoni horribly wasted a counter-attack by aiming his cross at Dida rather than both Flachi and Diana in the middle.
Serginho's daisy-cutter whistled past the near post on Kaka's assist, but Seedorf went even closer with a screamer from almost 40 metres that slammed the base of the upright to Antonioli's left.
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Milan: Dida; Stam, Nesta, Kaladze, Serginho (Jankulovski 85); Gattuso (Cafu 75), Pirlo, Seedorf; Kakà; Shevchenko, Inzaghi (Gilardino 65)
Sampdoria: Antonioli; Castellini, Pavan, Sala, Pisano; Diana, Volpi, Palombo, Gasbarroni (Zenoni 69); Bazzani (Kutuzov 5) (Foti 89), Flachi
Ref: De Santis