Pazzini found the target in the 15th and 48th minutes at the San Siro - his second coming following a cross from Diego Milito - to raise his scoring total to 11 league goals since transferring from Sampdoria in January.

Nagatomo made it 3-0 in the 63rd with a rising angled shot from within the area, his second score of the season, and Pablo Ledesma pulled one back for Catania in the 66th.

The five-time defending champion, Inter was already secure of finishing second behind AC Milan.

Inter faces Palermo in the Italian Cup final next Sunday.

Palermo was beaten 3-1 at home by Chievo Verona.

Elsewhere, last-place Bari won 4-0 in Bologna with a hat trick from 18-year-old forward Francesco Grandolfo, who was playing his third match in the top division. Still, Bari will be in Serie B next season.

Also, it was: Brescia 2, Fiorentina 2; Cagliari 1, Parma 1; and Genoa 3, Cesena 2.

Four more matches later had implications on positions in Europe.

Udinese needed one point against Milan to clinch fourth place and the final Champions League berth and was expected to get it since Milan sealed the title two weeks ago.

Lazio was at Lecce with a slim chance of finishing fourth, and Roma needed one point against already relegated Sampdoria to finish sixth and take the final Europa League spot.

Juventus, which also had a chance of qualifying for the Europa League, was hosting Napoli. The match marked Luigi Del Neri's last as Juventus manager.