Photos of the Day: The Top 5 shots from Roland Garros

The first day of Roland Garros 2019 is in the books, and the tournament is already full of memorable moments. Here are the top five photos from Day 1:

1. Roger Federer defeated Italy's Lorenzo Sonego, 6-2, 6-4, 6-4. Although he has stated he doesn't know what to expect, the Swiss is certainly playing to win his 21st Grand Slam title.

2. Frenchman Nicolas Mahut almost gave back his wild card. Good thing he didn't, because he scored one of the biggest wins of his career against 2018 semifinalist Marco Cecchinato, 2-6, 6-7 (6), 6-4, 6-2, 6-4. It took over three hours to get the win, with Mahut receiving a standing ovation from the home crowd and a hug from his son.

3. Russian 18-year old Anastasia Potapova ousted former No. 1 Angelique Kerber in the biggest upset of the day, 6-4, 6-2.

4. Garbine Muguruza battled with Taylor Townsend, and in the end came out with a 5-7, 6-2, 6-2 win, becoming the first player to win on Court Simonne Mathieu.

5. Nestled in a botanical garden and surrounded by four greenhouses, Court Simonne Mathieu impressed in her debut. It's a breathtaking venue, and it's safe to say we already have a big winner at Roland Garros.