Inter dismantled Sampdoria in Genoa on Sunday, as Mauro Icardi returned to his former club and scored four in an emphatic win.
Napoli will have watched on with glee as Juventus were held to a scoreless draw at struggling SPAL.
Fiorentina returned to action a week after the sudden death of captain Davide Astori in a home game on Sunday played in a poignant atmosphere.
Gianluigi Donnarumma out, Pepe Reina in? AC Milan want to sign the Napoli goalkeeper amid uncertainty surrounding their own shot-stopper.
There will be no Serie A matches played on Sunday out of respect for Fiorentina's Davide Astori, who has passed away.
After Juventus left it late to beat Lazio, Edin Dzeko scored twice to put a serious dent in Napoli's title hopes at the Stadio San Paolo.
Juventus left it late to extend their winning streak in Serie A as Paulo Dybala downed Lazio with a stoppage time winner.
Inter striker Mauro Icardi is fit to face Milan in the derby on Sunday, according to coach Luciano Spalletti.
Mino Raiola invited Napoli to target soon-to-be free agent Mario Balotelli, who has flourished with Nice in Ligue 1.
Despite signing a long-term AC Milan contract extension as recently as July, Gianluigi Donnarumma has been advised to leave by his agent.
Napoli ran riot in Sardinia with a 5-0 victory over Cagliari, with Marek Hamsik moving closer to another goalscoring milestone.
Benevento are still searching for their first away point in Serie A after conceding twice after the break at the San Siro
To help cope with the absence of left-back Faouzi Ghoulam, Hrvoje Milic has signed for Napoli on a free transfer.
AC Milan are seven points off the Champions League qualification places after beating Sampdoria 1-0 at San Siro.
Goran Pandev was Genoa's hero as Inter suffered their latest setback in the race for Champions League qualification in Serie A.
Inter's Milan Skriniar has named Barcelona, Real Madrid and the Manchester clubs as ideal destinations if he leaves before next season.
Marek Hamsik only managed 45 minutes for Napoli on Saturday, but they were nevertheless able to return to the Serie A summit.
Gianluigi Buffon will play his 500th league game for Juventus on Friday, while Massimiliano Allegri reaches 200 matches in charge.
Inter will again be without Mauro Icardi for Sunday's clash with Bologna, leaving the striker on 99 Serie A goals.
Juventus return to Serie A's summit after beating Fiorentina 2-0, with former Viola star Federico Bernardeschi scoring on his return.
Inter look to have beaten Atletico Madrid to the signing of talented striker Lautaro Martinez, according to Racing Club's president.
Gonzalo Higuain goes into Friday's trip to Fiorentina in fine form and Juventus coach Massimiliano Allegri is happy he is scoring again.
Dries Mertens scored but later went off injured as Napoli eased past Benevento and moved back above Juventus in Serie A.
Andrea Barberis scored a second-half equaliser as Crotone fought back to claim a point against an out-of-sorts Inter.
Dries Mertens would be willing to play anywhere - even in goal - if it meant Napoli winning the Serie A title.
Inter have loaned Yuto Nagatomo to Galatasaray until June this year, with the full-back having struggled for playing time this term.
Inter's wait for their first win of 2018 goes on after they were undone by another late goal, this time at SPAL.
Chievo saw two players dismissed as a Sami Khedira and Gonzalo Higuain lifted Juventus back to the top of Serie A.
Only a contract extension at Juventus would see Gianluigi Buffon continue his playing career beyond this season.
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Patrick Cutrone and Andre Silva scored second-half goals as AC Milan survived an almighty scare against Chievo.
Although Juventus have kept nine straight Serie A clean sheets, winning 12 games in a row in the league, Massimiliano Allegri wants more.
Linked with Chelsea in January, Edin Dzeko is glad he stayed at Roma after sending the Giallorossi into the Champions League last eight.
Napoli were leapfrogged by Juventus in the Serie A table on Sunday, but head coach Massimiliano Allegri cautioned against over-confidence.
Fiorentina coach Stefano Pioli offered a touching tribute to the late Davide Astori ahead of the side's return to Serie A action.
A look at the stats behind Mauro Icardi's 103 Serie A goals