On 18 February 2008, two days after losing in the semifinals of the Tier-III Cachantún Cup in Viña del Mar to top seed Flavia Pennetta, Parmentier made her debut in the top 50 of the singles rankings; she rose from world No. 53 at the start of the 2008 Cachantún Cup to No. 47. She won the title at Bad Gastein in July - it was her second career WTA (and first Tier III) singles title. Seeded No. 4, she defeated top seed Ágnes Szávay in the semifinals before defeating qualifier Lucie Hradecká in the final. Parmentier was nominated to play at the Summer Olympics after Mary Pierce and Amélie Mauresmo withdrew. She lost her singles first-round match to the No. 16 seed Dominika Cibulková and her doubles first-round match (she was paired with Tatiana Golovin) to the Indian pair of Sania Mirza and Sunitha Rao by walkover.