Lazio squandered a two-goal advantage to draw 2-2 at Inter Milan but will spend the winter break in third spot in Serie A after Sampdoria and Genoa also failed to win on Sunday.
Lazio moved above Napoli on goal difference. Sampdoria was also on 27 points after it was held to a 2-2 draw at home to Udinese in the final round of Serie A fixtures in 2014.
Genoa remained a point further back after losing 2-1 at relegation-threatened Torino.
Earlier, Chievo Verona beat city rival Hellas Verona 1-0 in a heated derby match.
Also, Fiorentina was held to a 1-1 draw by Empoli, while Atalanta fought back from two goals down to draw 3-3 at home to Palermo.
Lazio knew it could move two points ahead of Napoli and Samp with a win at San Siro and got off to a fantastic start when Felipe Anderson fired it in front with less than two minutes on the clock.
The Brazilian doubled his tally in the 37th following a fantastic run from near the halfway line and Inter appeared to be heading for its third defeat in Roberto Mancini's five matches back in charge.
Sampdoria was in confident mood after holding league leader Juventus to a 1-1 draw in Turin last weekend and it took the lead in the 15th minute.
Udinese goalkeeper Orestis Karnezis could only punch clear Angelo Palombo's cross and it went straight to Pedro Obiang, who turned into the empty net.
However, the match turned in four minutes as Alexander Geijo scored his first Serie A goal in his first start to level matters shortly before Danilo was left unmarked to head Udinese in front.
Manolo Gabbiadini headed Lorenzo Di Silvestri's cross into the top right corner on the hour mark in what could have been his last match for Sampdoria before a likely January move to Napoli.
Geijo almost scored a late winner but his header thumped the post.
Udinese was reduced to 10 men two minutes from time when Thomas Heurtaux was sent off following a second yellow card.
Genoa started the day level with Samp and Lazio on 26 points, and last weekend's defeat to Roma was its first league loss in more than two months.
Iago Falque fired Genoa in front shortly before halftime but Torino captain Kamil Glik scored twice from close range after the interval.
Fiorentina failed to capitalize on the results of those above it as it remained eighth, three points behind Napoli, after an entertaining Tuscan derby.
Juan Manuel Vargas had given Fiorentina the lead with a fierce strike after Empoli failed to clear a corner but Lorenzo Tonelli escaped his marker to nod in a Mirko Valdifiori corner from six yards.
Chievo snatched victory in the other derby of the day but replays showed Alberto Paloschi was offside as he headed in Ervin Zukanovic's superb cross into the box with nine minutes remaining.
Both sides also had penalty claims turned down.
Nene had gone closest for Verona when he headed a corner just over the crossbar, while Chievo's Ivan Radovanovic almost scored a wonder goal but Verona goalkeeper Francesco Benussi was alert to turn the effort from near the halfway line over his bar.
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