Duilio Beretta
Duilio Beretta Avalos is a Peruvian professional tennis player.
He won the finals stage of Boys' Doubles events on the French Open and US Open with Ecuadorian tennis player Roberto Quiroz in 2010. They defeated the Argentinian pair Facundo Argüello and Agustín Velotti in France and won against Oliver Golding and Jiří Veselý in the United States.
ATP Challenger and ITF Futures finals
Singles: 8 (2–6)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score | |||||||||||||||||||||||||||||||||||||
| Loss | 0–1 | Chile F2 | Futures | Clay |  dts|May 2011Doubles: 26 (18–8)
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