David Pablo Nalbandian (Armenian: Դավիդ Փաբլո Նալբանդյան; born 1 January 1982) is an Argentine retired professional tennis player and former world No. 3. He was runner-up at the 2002 Wimbledon Championships and the winner of the Tennis Masters Cup in 2005. He has also won two Masters 1000 events. Nalbandian is the only Argentine player in history who ever reached the semi-finals or better at all four Grand Slam tournaments and reached the men's singles final at Wimbledon.

David Nalbandian was born in the small city of Unquillo in Córdoba Province, Argentina. He became a professional tennis player at the age of 18.

As a junior, Nalbandian reached as high as No. 3 in the world in December 1998 (and No. 5 in doubles in 2000), soon after winning the US Open boys' singles.

He turned professional in 2000. In 2001, he finished in the ATP top 50 for the first time. He finished 2002 as the No. 1 Argentine and South American for the first time in his career, winning two ATP titles and reaching the Wimbledon final, where he beat David Sánchez, Paul-Henri Mathieu, George Bastl, Wayne Arthurs, Nicolás Lapentti and Xavier Malisse before losing to Lleyton Hewitt.

Nalbandian did not reach another Wimbledon final in 2003, as he was knocked out in the round of 16 by Tim Henman. He did however have an impressive run at the U.S. Open, taking out both of the Wimbledon finalists 20th seed Mark Philippoussis and second seed Roger Federer on the way to a semifinal matchup with Andy Roddick. It was the second time in less than a month that he had met Roddick in a high-stakes match, having lost to him in the final of the Rogers Cup a few weeks earlier. Nalbandian started strongly, taking a two sets to love lead, and held a match point in the third-set tiebreak. There was a little bit of controversy during the match, when a fan yelled "out" at 7–7 in the tiebreak, causing Nalbandian to mishit his following shot when he thought the linesman was the one who called it. Roddick took the point and eventually prevailed in the tiebreak. Ultimately, he was unable to finish the match off and eventually lost 6–7, 3–6, 7–6, 6–1, 6–3. He finished 2003 ranked No. 8 in the world.

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