Guler competed for the women's middleweight category (67 kg) at the 2008 Summer Olympics in Beijing, after defeating Greek taekwondo jin and Olympic silver medalist Elisavet Mystakidou in the final match of the European Qualification Tournament in Istanbul.[3] She lost the first preliminary match to Argentina's Vanina Sánchez, who was able to score four points at the end of the game.[4]
Sibel Güler was interested in swimming before she immigrated to Turkey with her family in 1989. During her school years in Turkey, she played in the volleyball team. In 1995, she began with taekwondo supported by her mother. With gaining success, she was transferred to TSE club in Ankara.[5][6]
Güler studied at the School of Physical Education and Sports of Ankara University[7] graduating in 2008. She has been a member of the Turkish women's national taekwondo team since 2000.[6]
On August 30, 2008, she married Taner Sağır, a world and Olympic weightlifting champion and a fellow immigrant from Bulgaria. The couple has a child. The family resides in Ankara in a street named after Sağır.[6][8]