Competing at the St. Petersburg Ladies' Trophy in Russia, Barthel was defeated in the first round by Alizé Cornet. In Qatar at the Qatar Total Open, Barthel suffered a three-set first-round loss at the hands of Agnieszka Radwańska. Barthel had multiple match points but failed to get the victory. After Qatar, Barthel traveled to Hungary to play at the Hungarian Ladies Open. Here, she reached the semifinal after wins over Kateryna Kozlova, third seed and defending champion Tímea Babos, and qualifier Ysaline Bonaventure. She lost in her semifinal match to top seed Dominika Cibulková. In Indian Wells at the BNP Paribas Open, Barthel was defeated in the second round by fourth seed Elina Svitolina. At the Miami Open, Barthel lost in round one to Tímea Babos.
