Roger Federer was all smiles after he beat Casper Ruud at the French Open. KENZO TRIBOUILLARD/AFP/AFP/Getty Images
Federer became the first player to play in 400 grand slam matches. Clive Brunskill/Getty Images Europe/Getty Images
Fans flocked to the stadium to watch the 20-time grand slam winner. Clive Brunskill/Getty Images Europe/Getty Images
Rafael Nadal, the 11-time tournament winner, lost his first set of the 2019 edition but still beat David Goffin in four sets. Clive Mason/Getty Images Europe/Getty Images
Nadal was sharp despite dropping the set, hitting 38 winners to just 21 unforced errors. Clive Brunskill/Getty Images Europe/Getty Images
But women's second-seed Karolina Pliskova fell in straight sets to Petra Martic. Adam Pretty/Getty Images Europe/Getty Images
Croatia's Martic has momentum, recently winning her first title in Istanbul. Clive Mason/Getty Images Europe/Getty Images
Anastasia Sevastova was all smiles after saving five match points -- in three different games -- to beat Elise Mertens. CHRISTOPHE ARCHAMBAULT/AFP/AFP/Getty Images
In another dramatic contest, Kei Nishikori beat Laslo Djere in five sets. His record in five sets improved to 22-6. PHILIPPE LOPEZ/AFP/AFP/Getty Images
Home hope Lucas Pouille, though, lost in five sets to Martin Klizan. He couldn't serve out the match at 5-3 in the fifth. CHRISTOPHE ARCHAMBAULT/AFP/AFP/Getty Images