(CNN) -- Champions Inter Milan failed to re-establish their seven-point lead in Italy's Serie A after being held 1-1 at home by AS Roma on Sunday night.
Jose Mourinho's side are now five points clear of Juventus, who crushed Atalanta 5-2 on Saturday, while city rivals AC Milan moved up to third place with a 2-1 win over Lazio.
Fiorentina are fourth on goal difference ahead of Sampdoria after winning 1-0 at Udinese.
Inter went behind after only 13 minutes as Montenegrin striker Mirko Vucinic made up for an earlier miss by looping a header past goalkeeper Julio Sergio after beating Inter's Brazilian center-back Lucio to Marco Motta's cross.
But summer signing Samuel Eto'o leveled three minutes after halftime with a clever turn and low shot into the left-hand corner to maintain Mourinho's unbeaten home league run at the San Siro.
AC Milan ended the day seven points behind Inter as Thiago Silva scored at both ends in Rome.
The Brazilian headed the opener past goalkeeper Fernando Muslera from a 21st-minute free-kick by Andrea Pirlo, then his com patriot Alexandre Pato nodded in Ronaldinho's cross 10 minutes before halftime to double the lead.
Mauro Zarate's deflected shot off Silva reduced the deficit in the 64th minute but Lazio, crushed 4-1 by Villarreal in the Europa League on Thursday, were left hovering above the relegation zone.
Fiorentina had to wait until six minutes from time to earn victory at Udinese, when Juan Vargas scored with a free-kick despite the attempt by defender Giovanni Pasquale to head the ball clear.
The result left La Viola on 21 points, ahead by goal difference from Sampdoria, who lost 2-0 at eighth-placed Cagliari after having Marius Stankevicius sent off three minutes before halftime.
Daniele Conti and substitute Alessandro Matri scored in the closing five minutes for the Sardinians.
Genoa bounced back from a recent poor run with a 4-2 win at home to bottom club Siena to go sixth, as striker Hernan Crespo scored twice in the opening 18 minutes.
Parma claimed seventh place after a 2-0 win at home to Verona, with Cristian Zaccardo (41) and on-loan Davide Lanzafame (72) scoring.
Palermo dropped to 11th after a 3-1 defeat by Bologna, who moved away from the relegation zone, while Livorno remain in the bottom three following a 1-0 defeat at Bari.