Haroon Rahim, (born 12 November 1949) is a Pakistani former tennis player. The former Pakistan and Asian number one, Rahim was the youngest tennis player ever to play for Pakistan in the Davis Cup at 15 years of age. He was also the highest ranking Pakistani tennis player ever (career high ATP ranking: 44 in 1977). He led the UCLA team to victory with Jeff Borowiak and Jimmy Connors in 1970–71 and was 1971 NCAA doubles champion with Jeff Borowiak.
He was from the Punjab city of Lahore, from a large family of avid tennis players. His father, Mir Abdur Rahim, was a civil servant who encouraged his children, sons and daughters, to play tennis. His father loved tennis so much that he said he wanted to die on the tennis court. In 1968, he died of a heart attack while playing doubles with friends at the picturesque Mayo Gardens, Lahore.
Haroon Rahim was only the second Pakistani after Khawaja Saeed Hai to make it to the Wimbledon's main draw. He played in many Grand Slams, in both singles and doubles. Rahim won two ATP titles, the first at Little Rock against former Wimbledon runner up, Alex Metreveli of the Soviet Union, and then the second at Cleveland, against the former record holder of the fastest serve, Australian, Colin Dibley, both in 1976.
He also lost a final to Spanish US Open winner and French Open finalist, Manuel Orantes.
He also won 3 doubles titles, one at Oslo in 1974, North Conway in 1975 and Little Rock in 1978. Success was also seen in the men's doubles where he made it to the quarter finals of the US Open, the third round of Wimbledon, and the second round of the French Open.
Haroon Rahim is the winner of the closest match ever played, he beat Tom Gorman 6-7 (3-5), 7-6 (5-1), 7-6 (5-4) Pennsylvania Grass Championships, as both players never losing their serve, each set went to a tie break with Haroon winning the match by just one point.
Last known to be in the US, Haroon retired from tennis, severed contact with his family and his whereabouts are unknown.