Carlos Alberto Berlocq (Spanish pronunciation:[kaɾlosalˈβeɾtoβeɾˈlok];[a][1] born February 3, 1983) is an Argentine former professional tennis player and coach nicknamed Charly, Panther and Warlocq. Berlocq's career-high singles ranking was World No. 37, achieved in March 2012. His favourite surface was clay.
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.
Berlocq struggled to adapt his level from the Futures and Challengers to the ATP main level events and achieved only limited success on the ATP Tour. However, his first win was significant. 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. After defeating Young, Berlocq played another American, James Blake, losing this match 0–6, 0–6 and therefore creating an unusual achievement of winning his first ATP-level match 6–0, 6–0 and then losing by the same scoreline in the next round.
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.
He beat Maxime Authom 1–6, 7–6(7–5), 7–6(7–4), 6–2 in the first round of the Australian Open before losing to Kei Nishikori 6–7(4–7), 4–6, 1–6. He lost his first round match at the French Open against 19th seed John Isner in straight sets. Berlocq won his first career title at the Swedish Open, defeating Fernando Verdasco in the final. He lost in the second round of the US Open in straight sets to Roger Federer after winning his first round match against Santiago Giraldo in five sets.