Mariana Duque Mariño (born 12 August 1989) is a Colombian tennis player, born in Bogotá. Her career high rank is No. 66, achieved on 12 October 2015. Her doubles tour rank as of July 8, 2013 was a career high of 100.

Mariana debuted on the International Tennis Federation (ITF) junior tour in 2004. As a junior, she reached the final of the girls' singles tournament at the 2007 French Open. She defeated the 10th-seeded Ksenia Pervak in the first round, and ousted Juniors World No. 1 Russian Anastasia Pavlyuchenkova in the semifinals. Mariana lost in the final to France's Alizé Cornet, in three sets. Mariana had some setbacks during the tournament, due to losing her tennis rackets at the airport. Without money to buy replacements, she had to play with borrowed rackets.

She won her first professional tournament in May 2006, in Mazatlán, Mexico.

Her biggest win in senior competition is winning against Anna Chakvetadze, No. 26 seed at the 2009 French Open, in three sets.

Appeared in her first Tour qualifying in Bogotá Copa Colsanitas and also played on the ITF Women's Circuit. In the 2005 Bolivarian Games where she won the silver medal in singles and in doubles.

Fell in Tour qualifying in Bogotá Copa Colsanitas, won three singles titles and three doubles titles on the ITF Circuit.

In her third full season on the Tour to enter the main draw, arrives in the first round defeating compatriot Viky Núñez Fuentes and being defeated in the second round for the first time by the Italian Flavia Pennetta, the same year he won three singles titles on ITF Circuit. and runner-up at 2007 French Open Junior in his first appearance on a Grand Slam and making history for Colombia, the first tennis player to reach each instance.

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