2018 French Open – Men's singles

Defending champion Rafael Nadal defeated Dominic Thiem in the final, 6–4, 6–3, 6–2 to win the men's singles tennis title at the 2018 French Open. It was his record-extending eleventh French Open title and 17th major title overall. Nadal equaled Margaret Court's all-time record of 11 singles titles won at one major and became the first player to achieve that feat in the Open Era. He lost only one set during the tournament (to Diego Schwartzman in the quarterfinals), and retained the world No. 1 singles ranking. Nadal and Roger Federer (despite having not playing the clay court season) were in contention for the top ranking.

With Alexander Zverev as the second seed, this was the first time since the 2006 Australian Open that a player outside of the Big Four was one of the top two seeds at a major.

Novak Djokovic was attempting to become the first man in the Open Era to achieve a double career Grand Slam, but he lost in the quarterfinals to Marco Cecchinato (he would eventually achieve the feat three years later). Djokovic's loss ensured a first time major finalist from the bottom half of the draw; Thiem emerged to be that player, and became the first Austrian player to reach a major singles final since Thomas Muster at the 1995 French Open.

Cecchinato, ranked 72nd and having failed to win a main draw match in his four previous major appearances, became the first unseeded men's singles semifinalist at the French Open since Gaël Monfils in 2008, the lowest-ranked male singles player to reach the French Open semifinals since Andriy Medvedev in 1999, and the first Italian man to reach a major singles semifinal since Corrado Barazzutti at the 1978 French Open.

Seeds
All seedings per ATP rankings. • 🇪🇸 Rafael Nadal (champion)

• 🇩🇪 Alexander Zverev (quarterfinals)

• Marin Čilić (quarterfinals)

• 🇧🇬 Grigor Dimitrov (third round)

• 🇦🇷 Juan Martín del Potro (semifinals)

•  Kevin Anderson (fourth round)

• 🇦🇹 Dominic Thiem (final)

• 🇧🇪 David Goffin (fourth round)

• 🇺🇸 John Isner (fourth round)

• 🇪🇸 Pablo Carreño Busta (third round)

• 🇦🇷 Diego Schwartzman (quarterfinals)

• 🇺🇸 Sam Querrey (second round)

• 🇪🇸 Roberto Bautista Agut (third round)

• 🇺🇸 Jack Sock (first round)

• 🇫🇷 Lucas Pouille (third round)

• 🇬🇧 Kyle Edmund (third round)

• 🇨🇿 Tomáš Berdych (first round)

• 🇮🇹 Fabio Fognini (fourth round)

• 🇯🇵 Kei Nishikori (fourth round)

• 🇷🇸 Novak Djokovic (quarterfinals)

• 🇦🇺 Nick Kyrgios (withdrew)

• 🇩🇪 Philipp Kohlschreiber (first round)

•  Stan Wawrinka (first round)

• 🇨🇦 Denis Shapovalov (second round)

• 🇫🇷 Adrian Mannarino (first round)

• 🇧🇦 Damir Džumhur (third round)

• 🇫🇷 Richard Gasquet (third round)

• 🇪🇸 Feliciano López (first round)

• 🇱🇺 Gilles Müller (first round)

• 🇪🇸 Fernando Verdasco (fourth round)

• 🇪🇸 Albert Ramos Viñolas (third round)

• 🇫🇷 Gaël Monfils (third round)