Harold Hackett
Harold Humphrey Hackett was an American tennis player.
Biography
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, 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 ranked in the U.S. Top 10 twice: No. 9 in 1902 and at No. 7 in 1906. He was inducted into the International Tennis Hall of Fame in 1961.
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 finals
Doubles (4 titles, 3 runner-ups)
| Result | Year | Championship | Surface | Partner | Opponents | Score |
| Loss | 1905 | U.S. Championships | Grass |  Fred Alexander | Holcombe Ward Beals Wright | 4–6, 4–6, 1–6 |
| Loss | 1906 | U.S. Championships | Grass | Fred Alexander | Holcombe Ward Beals Wright | 3–6, 6–3, 3–6, 3–6 |
| Win | 1907 | U.S. Championships | Grass | Fred Alexander | Nat Thornton Bryan M. Grant | 6–2, 6–1, 6–1 |
| Win | 1908 | U.S. Championships | Grass |  Fred Alexander | Raymond Little Beals Wright | 6–1, 7–5, 6–2 |
| Win | 1909 | U.S. Championships | Grass | Fred Alexander | George Janes Maurice McLoughlin | 6–4, 6–4, 6–0 |
| Win | 1910 | U.S. Championships | Grass | Fred Alexander | Tom Bundy Trowbridge Hendrick | 6–1, 8–6, 6–3 |
| Loss | 1911 | U.S. Championships | Grass | Fred Alexander | Raymond Little Gustav Touchard | 5–7, 15–13, 2–6, 4–6 |