Carlos Alberto Berlocq (born February 3, 1983 in Chascomus) is an Argentine professional male tennis player nicknamed Charly, Panther and Warlocq. His favourite surface is clay and he is currently coached by Walter Grinovero. Berlocq's career-high singles ranking is World No. 37, achieved in March 2012.
Berlocq started playing tennis at the age of four and has had his success on the ATP Futures and Challenger circuits. In 2004 he made six consecutive finals in the Futures events, winning three of them, two finals each in Argentina, France and Slovenia. He also made his first Challenger final in Manta, Ecuador losing to Giovanni Lapentti and then won another Futures title in Argentina.
Berlocq struggled to adapt his level from the Futures and Challengers to the ATP main level events and has to date achieved only limited success on the ATP, however his first win was significant. In the ATP Masters Series event in Miami Berlocq defeated the much-hyped American junior and wildcard entrant Donald Young 6–0, 6–0. Both Berlocq and Young had never won a match on the ATP and this win was achieved on hardcourt which is not Berlocq's favoured surface. After defeating Young, Berlocq then played American James Blake and lost this match, 0–6, 0–6, 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.
His best result of the year was in Viña del Mar, where he defeated World No. 25 Juan Ignacio Chela in the semifinals to set up a final appearance against Juan Mónaco, which he lost. He made the quarterfinals in São Paulo, Buenos Aires, and Acapulco, losing to World No. 11 Nicolás Almagro, David Nalbandian, and Santiago Giraldo, respectively. He also made the quarterfinals in Houston, exiting against World No. 15 Feliciano López. He did not have much success in the Masters 1000 events or Grand Slams, exiting in the first or second round of each. In Umag, he made the quarterfinals, losing to World No. 19 Alexandr Dolgopolov.