Napoli surrendered the lead to lose 3-2 at home to Atalanta on Saturday, dropping from first to third in the Serie A standings.
Juventus suffered another setback as they lost 1-0 at home to Atalanta after a Duvan Zapata goal on Saturday, with a fifth defeat in 14 games.
Atalanta's Luis Muriel came off the bench to equalise two minutes from time and snatch a 3-3 draw at Young Boys in a frenetic finish.
Cristiano Ronaldo saved Manchester United in the Champions League again as his stoppage time goal earned them a 2-2 draw away to Atalanta.
A federal investigation has opened in Italy into a number of transfers in Serie A, an Italian Football Federation official has said.
Udinese striker Beto's dramatic stoppage-time header earned his side a point in a 1-1 draw at Atalanta in Serie A on Sunday.
Cristiano Ronaldo scored a late goal as Manchester United mounted a second-half rally to beat Atalanta 3-2 in Champions League group-stage action.
Morale at Manchester United has taken a significant hit after Saturday's defeat to Leicester is the latest setback in a poor run of form.
AC Milan continued their impressive start to the Serie A season on Sunday, surviving a late Atalanta comeback to earn a 3-2 victory in Bergamo.
Atalanta maintained their good start in the Champions League after an opportunist goal from Matteo Pessina saw them beat Young Boys 1-0.
Inter Milan maintained their unbeaten record in Serie A with an entertaining 2-2 draw against Atalanta on Saturday that featured late drama.
Atalanta's Marten de Roon went to the club shop and offered to pay for jerseys with his name on the back. But nobody showed up.
Duvan Zapata's brilliant turn and finish earned Atalanta a battling 1-0 victory at Salernitana on Saturday.
A late Robin Gosens equaliser earned Atalanta a 2-2 draw at Villarreal on Tuesday as the Spanish side made their first appearance in 10 years.
Dusan Vlahovic scored two penalties to earn Fiorentina a 2-1 win away to Atalanta in Serie A on Saturday.
Young substitute Roberto Piccoli struck deep into stoppage time to earn Atalanta a last-gasp 2-1 victory at Torino.
Tottenham Hotspur have completed the signing of defender Cristian Romero from Atalanta, the club announced on Friday.
Tottenham are expected to confirm the €55 million signing of Atalanta defender Cristian Romero within the next 48 hours, sources have told ESPN.
Germany international and Atalanta left-back Robin Gosens has been linked with a switch to Barcelona this summer. Transfer Talk has the latest.
AC Milan secured a long-awaited return to the Champions League on Sunday as two Franck Kessie penalties earned a 2-0 win over Atalanta.
Federico Chiesa clinched a Coppa Italia triumph for Juventus and a first trophy for coach Andrea Pirlo with a 2-1 victory vs. Atalanta in the final.
Atalanta secured Champions League qualification for a third consecutive season with a 4-3 win over Genoa on Saturday.