|Full name||Harold Humphrey Hackett|
|Born||July 12, 1878
Hingham, MA, USA
|Died||November 20, 1937
New York, NY, USA
|Plays||Right-handed (1-handed backhand)|
|Int. Tennis HOF||1961 (member page)|
|Highest ranking||No. 7 (1906 U.S. ranking)|
|Grand Slam Singles results|
|US Open||QF (1906)|
|Grand Slam Doubles results|
|US Open||W (1907, 1908, 1909, 1910)|
Harold Humphrey Hackett (July 12, 1878 – November 20, 1937) was an American tennis player.
Born in Hingham, Massachusetts, but a long-time resident of New York, Hackett turned in his best results in doubles with Fred Alexander. Beginning in 1905, they were finalists at the U.S. National Championships a record seven consecutive years, winning in 1907, 1908, 1909, and 1910.
A graduate of Yale University, Hackett and Princeton University graduate Alexander won the U.S. Indoor doubles three times (1906–08), and he teamed with Walter Hall to win the U.S. Clay Court doubles title in 1912.
The following year, 1913, he was player-captain of the U.S. Davis Cup team that beat the United Kingdom in the final to win the Cup.
Hackett was a member of the Tennis Players' Committee who in 1915 advocated moving the National Tennis Championships from Newport, MA to Forrest Hills, NY.
Grand Slam doubles finals 
Titles (4) 
|1907||US Championships||Fred Alexander|| Nat Thornton
Bryan M. Grant
|6-2, 6-1, 6-1|
|1908||US Championships||Fred Alexander|| Raymond Little
|6-1, 7-5, 6-2|
|1909||US Championships||Fred Alexander|| George Janes
|6-4, 6-4, 6-0|
|1910||US Championships||Fred Alexander|| Tom Bundy
|6-1, 8-6, 6-3|
Runner-ups (3) 
|1905||US Championships||Fred Alexander|| Holcombe Ward
|4-6, 4-6, 1-6|
|1906||US Championships||Fred Alexander|| Holcombe Ward
|3-6, 6-3, 3-, 3-6|
|1911||US Championships||Fred Alexander|| Raymond Little
|5-7, 15-13, 2-6, 4-6|
- United States Lawn Tennis Association (1972). Official Encyclopedia of Tennis (First Edition), p. 409.
- "Old Doubles Team Wins Championships". The New York Times. 20 Aug 1909. pp. PDF. Retrieved 11 May 2012.
- "Hold Tennis Title in Doubles Play" (PDF). The New York Times. 18 Aug 1910. Retrieved 11 May 2012.
- "Tennis Hall of Fame - Harold Hackett". International Tennis Hall of Fame. Retrieved 11 May 2012.
- "Newport May Lose Tennis Tourney" (PDF). The New York Times. 17 Jan 1915. Retrieved 11 May 2012.
- International Tennis Hall of Fame - Player Profile
- Davis Cup - Player Profile
- Tennis Archives.com - Player Profile
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