2016 itfcat quadri upsets top seed

I think you may be referring to the 2016 ITF Catania Quadri tournament, which was a professional tennis tournament held in Catania, Italy.

According to the ITF website, the top seed in the men's singles draw was Matteo Donati, an Italian tennis player. However, he was upset in the quarterfinals by a player named Alessandro Bega, who won the match in straight sets (6-3, 6-4).

Bega went on to win the tournament, defeating the second-seeded player, Salvatore Caruso, in the final.