AC Milan's problems with consistency continued as a poor performance saw it lose 2-0 at Sampdoria in Serie A on Sunday.
Milan didn't even have a shot on target as late goals from Duvan Zapata — unintentionally helped by his cousin — and substitute Ricky Alvarez condemned the Rossoneri to its second defeat of the season.
"Samp was superior to us and deserved the victory," Milan coach Vincenzo Montella said. "We didn't perform. We were insufficient on a mental level and in our determination as well as technically.
"It's a defeat which hurts us and we will have to understand why it happened. We'll need to analyze everything without hiding ourselves."
Milan slipped to sixth, six points behind leaders Napoli and Juventus. Inter Milan is two points below the top two after a narrow 1-0 victory over Genoa, with lazio three points further back after beating Hellas Verona 3-0.
UNCONVINCING INTER
Inter goalkeeper Samir Handanovic pulled off a number of saves before a late goal helped the Nerazzurri secure a 1-0 win over Genoa, which ended the match with nine men.
Inter had lost its perfect record midweek in a surprise 1-1 draw against Bologna so needed a win to keep up the pressure on Napoli and Juventus.
It was Genoa which had the better of the chances, although Inter did hit the post through Marcelo Brozovic on the stroke of halftime.
However, Inter scored what was to prove the winner three minutes from time when Danilo D'Ambrosio headed in a corner.
"There's still a bit of difference with Juventus and Napoli, we have to narrow the gap by reconsolidating the certainties which should belong to a great club like Inter," coach luciano Spalletti said.
"This team hasn't reached its limits yet... we have to reach those limits and then surpass them."
Genoa players Stephane Omeonga and Adel Taarabt were shown straight red cards within minutes of each other in stoppage time.
IN-FORM IMMOBIlE
Ciro Immobile maintained his impressive scoring streak as he netted another two goals to help lazio win 3-0 at Verona and bounce back from its hefty midweek defeat to Napoli.
Both Immobile's goals came in the first half, opening the scoring from the penalty spot after Adam Marusic was tripped by Samuel Souprayen.
Immobile's second was a stunning solo goal as he weaved his way past two Verona defenders before firing into the far bottom corner for his 11th goal in all competitions for lazio this season.