The 1989–90 Serie A season was another successful year for Napoli, with Diego Maradona being among the leading goalscorers in Serie A, behind Marco van Basten of Milan and Roberto Baggio of Fiorentina. But while Baggio's Fiorentina narrowly avoided relegation, Maradona's Napoli won their second Serie A title in four seasons, while Van Basten helped Milan retain the European Cup as compensation for their failure to win the Serie A title, having finished two points behind Napoli. Demoted to Serie B for 1990–91 were Udinese, Hellas Verona, Cremonese and Ascoli. In Europe, Sampdoria won the Cup Winners Cup and Juventus the UEFA Cup, making this year the most successful in Italian football history.
The 1986–87 Serie A season ended with Napoli doing the "domestic double", winning their first Scudetto and third Coppa Italia, spurred on by their talismanic captain Diego Maradona, who had also just played a key part in World Cup glory for his home country of Argentina.
The 1984–85 Serie A season heralded Hellas Verona's first and so far only Scudetto. Unusually, none of the big three of Juventus, Milan or Internazionale managed to finish in the top two. Ascoli, Lazio and Cremonese all were relegated to Serie B. Italy had one more place from the UEFA ranking.
Juventus F.C. finished second in Serie A and reached the final of the Coppa Italia in this season.
In the 1984–85 season, manager Osvaldo Bagnoli guided Hellas Verona F.C. to its only Serie A championship, shocking the Italian football public.
During the 1984–1985 season, Milan Associazione Calcio competed in Serie A and Coppa Italia.
Juventus F.C. finished 6th in the 1984-85 Serie A season and won the European Cup for the first time at the Heysel Stadium. However, the season was marked by the Heysel Stadium disaster in which 39 people died, mostly Juventus supporters.
S.S. Lazio finished in 15th place, relegated from Serie A.
In the 1984–1985 season, Torino Calcio competed in Serie A.
U.C. Sampdoria recorded its best league season since 1960-61, thanks to a fourth place-finish. President Mantovani had surprised the football world by signing Liverpool stalwart Graeme Souness to the squad, and it paid off, with Souness adapting quickly to Italian football, also helping the team to win the 1985 edition of Coppa Italia, which was the first ever title for the club. The defensive line, with Moreno Mannini, Pietro Vierchowod and Antonio Paganin among the crew, was the main reason for the success, Sampdoria conceding just 23 goals in 30 league matches played. Quite a few of the players were still with the club when it finally won the league title in 1991.
Associazione Sportiva Roma did not manage to repeat its successful previous two seasons, and instead took a step back to seventh in the league championship. New coach Sven-Göran Eriksson was soon to get to grips with Italian football, with Roma improving the next year to be a force for the title.
S.S.C. Napoli had its best league season in five years, finishing third in the 1985–86 league season. Due to Roma's collapse in the final rounds of the season, Napoli closed to within two points of second place, also having a significant margin to Torino in fourth. Diego Maradona prepared for his glorious World Cup with eleven goals and several assists.
S.S.C. Napoli won its first Serie A title with recently crowned World Cup winner Diego Maradona as their most influential player. Central defender Ciro Ferrara got his breakthrough, helping out the team to win the trophy. The two new signings Andrea Carnevale and Fernando De Napoli also proved crucial in the title-winning campaign, which sparked off fanatical celebrations in Naples.
Hellas Verona F.C. came back strongly following its disappointing defense of the 1985 Serie A crown, with a fourth place and European qualification. A notable signing prior to the season was former World Cup hero Paolo Rossi, who spent his final footballing season at Hellas, scoring four goals.
U.C. Sampdoria started its march towards an eventual Serie A championship and European Cup final with its appointment of Yugoslav coach Vujadin Boškov. With Britons Graeme Souness and Trevor Francis leaving the squad, Boškov built his team around young Italian players, with Roberto Mancini, Gianluca Vialli, Pietro Vierchowod and Moreno Mannini among the bulwark of the squad as Sampdoria finished 6th in a tight battle involving several teams for 3rd in the championship.
S.S.C. Napoli only just failed to defend its inaugural Serie A title, finishing three points behind A.C. Milan. Napoli proved to be the most offensive team in the entire league, with Careca and Diego Maradona dominating the scoring charts. Due to Milan's strong defence that was not enough for the title, and due to a 3-2 defeat at home to the eventual champions, the title defence got out of reach.
A.C. Fiorentina finished in the midfield of Serie A, beating Roma 1-0 in a playoff match due to a goal by ex-Roma player Roberto Pruzzo. The season also marked the international breakthrough of Roberto Baggio, the striker scoring 15 league goals, also setting up several of Stefano Borgonovo's 14.
S.S.C. Napoli won their second ever Italian championship, thanks to a new club record in points scored over the course of the season. Diego Maradona scored 16 of the side's 57, whilst the contributions of other players such as Careca and Gianfranco Zola gave Napoli enough of an attacking edge to claim the title.
