Mladenovic began the year by playing at the Hopman Cup alongside Richard Gasquet. The pair won their first tie against Germany's Andrea Petkovic and Alexander Zverev 2–1 (Mladenovic lost her singles match against Petkovic), and their second tie against Great Britain's Daniel Evans and Heather Watson 3–0. In France's third Group A tie against Switzerland which would decide which team would enter the final, Mladenovic (following Gasquet's defeat to Roger Federer) defeated Belinda Bencic and triumphed with Gasquet against the Swiss pair in mixed doubles, winning the tie 2–1. In the final, Mladenovic and Gasquet faced Americans Jack Sock and CoCo Vandeweghe. Although Gasquet won his singles match and Mladenovic lost hers, the French duo won the decisive mixed-doubles match, meaning that France were the 2017 Hopman Cup champions.