The former Top 10 player rallied to beat Alex Michelsen 3-6, 7-5, 6-4 in Tuesday's first round, but another sentimental favorite, Canada's Milos Raonic, was forced to withdraw.

Iga Swiatek, Naomi Osaka and Coco Gauff were also spotted Tuesday on the transformed grounds of Roland Garros.

Sixteen nations secured entries announced Thursday, with two spots remaining in the mixed team event. The U.S. features four Top 20 players.