Pironkova started her grass-court season at the Aegon Classic, where in the first round she beat Brit Katie Stan, but came short against German fourth seed Angelique Kerber, losing in three sets. She then reached her second premier-level event quarterfinal in 2015 in Eastbourne at the Aegon International, where she beat Marina Erakovic in the first round, 16th seed Samantha Stosur, and former Grand Slam finalist Dominika Cibulková, before being beaten by eventual finalist Agnieszka Radwańska. At Wimbledon, she lost to 30th seed and Aegon International winner, Belinda Bencic, in three sets.