Underdogs Verona have came from behind to beat Serie A leaders Juventus 2-1 on Saturday, despite Cristiano Ronaldo setting another record.
The upset result gives Inter Milan the chance to join champions Juve on 54 points if they beat AC Milan on Sunday.
Verona, now on an unbeaten run of eight games, are sixth and in the Europa League zone with 34 points.
Cristiano Ronaldo struck home the opener for the champions in the 65th minute to become the first Juventus player to score in 10 successive matches - taking his league season tally to 20 goals.
Fabio Borini levelled on 76 minutes in similar fashion as Juve playmaker Miralem Pjanic involuntarily set him up for a clinical drive into the far corner.
Substitute Giampaolo Pazzini converted a penalty on 86 minutes for the hosts, awarded after video review for Leonardo Bonucci's handball.
Atalanta rallied to beat Fiorentina 2-1 earlier in the day to record a first away win at La Viola since 1993 and strengthen their hold on fourth place.
Atalanta occupy the last available place for next term's Champions League.
A Federico Chiesa drive put the hosts ahead in a first half dominated by the Bergamo visitors, who levelled after the break when Duvan Zapata turned in an Alejandro Gomez cross.
Substitute Ruslan Malinovskyi fired in from outside the box on 72 minutes to give Atalanta the win.
"These were three very important points for the standings. It was a good day," Atalanta coach Gian Piero Gasperini said."
"It is a very hard season. Last year we battled for every point until the end (to finish third) and I think it will happen again."
Sampdoria defeated troubled Torino 3-1 with a brace from Gaston Ramirez and a spot kick by Fabio Quagliarella.
Torino played under new coach Moreno Longo and found a second-half lead from Simone Verdi's deflection, but saw Ramirez curl in a free kick on 70 minutes and fire home a second five minutes later.
Armando Izzo was red-carded for a last-man foul on Quagliarella, who converted the ensuing penalty against his former team in the 79th.
Il Toro have lost their past four games, including a 7-0 thumping against Atalanta and a 4-0 defeat at Lecce, to slide to 12th while Samp are 16th, seven points clear of the drop zone.