**Juventus** booked a Champions League place next season as Manuel Locatelli's penalty secured a thrilling 3-2 victory at relegated **Venezia**.
Locatelli kept his nerve 17 minutes from time after Venezia, relegated with the defeat, had fought back in a vain attempt to deny Juventus finishing fourth in Serie A.
Daniel Fila fired Venezia ahead after two minutes and a quickfire Juventus equaliser through Alberto Costa was ruled out by VAR.
Juventus did level through Kenan Yildiz's fine finish after 25 minutes and Costa set up Randal Kolo Muani six minutes later.
Ridgeciano Haps equalised for Venezia 10 minutes after the restart, but Hans Nicolussi Caviglia brought down Francisco Conceicao and Locatelli calmly dispatched the spot-kick to guarantee Juventus joy and **Roma** pain.
Despite winning 2-0 at **Torino**, Roma came fifth and will play in the Europa League next season.
Leandro Paredes converted from the spot to put Roma ahead after 18 minutes and Alexis Saelemaekers soon added a second after the restart.
**Atalanta** were already assured of third place and Champions League qualification but lost 3-2 at home as **Parma** secured their top-flight survival.
Daniel Maldini scored twice in the space of 60 seconds to give Atalanta a comfortable half-time lead.
But Parma replied through Antoine Hainaut and a Jacob Ondrejka double, with the winner coming in the first minute of stoppage time.
**Empoli**'s relegation was confirmed by a 2-1 home defeat to **Verona**.
**Fiorentina** qualified for the European Conference League spot next season at **Lazio**'s expense with a 3-2 victory at 10-man **Udinese**.
Nicolo Fagioli, Pietro Comuzzo and Moise Keane - who scored the winner eight minutes from time - turned around an early deficit against Udinese hosts, who had Jaka Bijol sent off for two bookable offences before half-time.
Lazio finished below Fiorentina on goal difference and miss out on European football altogether after losing 1-0 at home to 10-man **Lecce**, who started the day in relegation danger.
Santiago Pierotti was sent off in first half stoppage time after Lassana Coulibaly had put the visitors ahead, but Lazio could not find an equaliser and were reduced to 10 themselves in the final seconds when Alessio Romagnoli saw red.
Robert Lewandowski netted a brace
**Barcelona** celebrated their LaLiga title success with a 3-0 victory at fourth-placed **Athletic Bilbao**.
Robert Lewandowski scored twice in the opening 17 minutes and Dani Olmo converted a stoppage-time penalty as Barcelona finished the campaign with 102 goals, becoming the first LaLiga side to reach three figures since 2016-17.
**Atletico Madrid** had earlier made absolutely certain of third spot by routing **Girona** 4-0 in Catalonia.
Substitute Alexander Sorloth scored a second-half hat-trick and Clement Lenglet was also on target as Girona's disappointing season ended on a low note.
Fifth-placed **Villarreal** finished on the same points total as Bilbao by beating **Sevilla** 4-2 for a sixth successive victory.
Yeremy Pino and Papa Gueye struck inside the opening eight minutes before Djibril Sow gave Sevilla hope.
Alex Baena restored the two-goal cushion and Gueye added a fourth after the restart, with Ramon Martinez managing a late consolation for the visitors.
**Union Saint-Gilloise** ended their 90-year wait for the Belgian league title but had to endure a nervy afternoon before beating visitors Gent 3-1 on Sunday to finish three points ahead of second-place Club Brugge.
The Brussels club went agonisingly close in the last two seasons and faced the potential of another last-day calamity before substitute Promise David came on in the second half to score twice in the space of seven minutes and ensure their title triumph.
Union, coached by 37-year-old former West Bromwich Albion and Brighton defender Sebastien Pocognoli, ended the season with 56 points while Club Brugge, whose game with Antwerp ended 1-1, finished with 53.
Formed in 1897, Union won 11 league titles between 1904 and their last in 1935 but went into serious decline in the early 1960s after being relegated, ending up in the fourth tier of Belgian football some two decades later.
But a revival sparked by investment from Tony Bloom, the owner of English Premier League club Brighton & Hove Albion, saw Union move up to the second division and then win promotion to the top flight in 2021 after a 48-year absence.
**Additional reporting: Reuters**