In his career, Hood won 13 out of the 26 top level doubles finals he was in. He turned professional in 1993, and currently resides in his city of birth, Buenos Aires. He won $US806,888 in earnings and was coached by Daniel Orsanic. He won his first doubles title in Santiago, Chile in 1998 and Palermo in 2005 was his last title. On October 27, 2003, Hood reached his highest doubles ranking of World Number 20. He partnered either Sebastián Prieto or Lucas Arnold Ker to win most of his doubles titles, although he did have other partnerships as well.
Hood was banned by the ITF of the illegal use of Finasteride after he had made the French Open quarterfinals in 2005. He thus planned to retire from the professional circuit. Hood, however, made a comeback in 2008. He last played on the tour in 2009.
In his first tournament of the year, he went to the semifinals with José Acasuso at the 2008 Copa Telmex. A week later, Hood teamed with Eduardo Schwank to win the Santiago, Chile Challenger on the ITF Men's Circuit. After two week's early losses alongside fellow Argentine partners in Challenger tournaments, he teamed with Guillermo Coria to reach the Naples Challenger semifinals, and then with Luis Horna to reach the Monza Challenger semifinals. Directly after this, he won a second title, at Chaisso located in Switzerland with Alberto Martín in a Challenger event. Two weeks later, a third Challenger triumph arrived with a victory over Marc Fornell and Caio Zampieri alongside Guillermo García López. After a few more tournaments, he received a wildcard entry with Rafael Nadal at the 2008 Queen's Club Championships.
- "Anti-Doping - Press Release - Decision in the case of Mariano Hood". ITF Tennis. 2006-08-02. Retrieved 2012-08-17.
- Queens Club Draw
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