Carlos Alberto Berlocq (Spanish pronunciation: [kaɾlos alˈβeɾto βeɾˈlok];[a][1] born February 3, 1983) is an Argentine former professional tennis player and coach nicknamed Charly, Panther and Warlocq.

Berlocq started playing tennis at the age of four and had success on the ATP Futures and Challenger circuits.

In 2004, he made six consecutive finals on the Futures circuit and won half of them, two each in Argentina, France and Slovenia.

He also made his first Challenger final in Manta, Ecuador, losing to Giovanni Lapentti before winning another Futures title in Argentina.

At the ATP Masters Series event in Miami, Berlocq defeated the much-hyped American junior and wildcard entrant Donald Young 6–0, 6–0.

Neither player had won a match on the ATP Tour and this win was achieved on a hardcourt, not Berlocq's favoured surface.

Berlocq won two consecutive matches for the first time on the ATP Tour to make the quarterfinals in Sopot after defeating Philipp Kohlschreiber and Lukáš Dlouhý.

Berlocq won his first career title at the Swedish Open, defeating Fernando Verdasco in the final.