2021 Monte-Carlo Masters

The 2021 Monte-Carlo Masters (also known as the Rolex Monte-Carlo Masters for sponsorship reasons) was a tennis tournament for male professional players played on outdoor clay courts. It was the 114th edition of the annual Monte Carlo Masters tournament. It took place at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France (though billed as Monte Carlo, Monaco) as a part of the Masters 1000 event on the 2021 ATP Tour.

The tournament's 2020 edition, which was scheduled for 13–19 April 2020, was cancelled due to the onset of the COVID-19 pandemic in France. Due to COVID-19 restrictions, there were no spectators in all stadiums during the 2021 tournament.

Singles

 * Stefanos Tsitsipas def. 🇷🇺 Andrey Rublev, 6–3, 6–3

Doubles

 * Nikola Mektić / Mate Pavić def. 🇬🇧 Dan Evans / 🇬🇧 Neal Skupski, 6–3, 4–6, [10–7]

Points
Because the Monte Carlo Masters is the non-mandatory Masters 1000 event, special rules regarding points distribution are in place. The Monte Carlo Masters counts as one of a player's 500 level tournaments, while distributing Masters 1000 points.

Prize money

 * per team

Seeds

 * Rankings are as of 5 April 2021

Other entrants
The following players received wildcards into the main draw:
 * Lucas Catarina
 * 🇮🇹 Lorenzo Musetti
 * 🇫🇷 Lucas Pouille
 * Holger Rune

The following players received entry via the qualifying draw:
 * 🇮🇹 Salvatore Caruso
 * 🇮🇹 Marco Cecchinato
 * 🇦🇷 Federico Delbonis
 * 🇮🇹 Thomas Fabbiano
 * 🇩🇪 Dominik Koepfer
 * 🇦🇺 Alexei Popyrin
 * 🇮🇹 Stefano Travaglia

The following players received entry as lucky losers:
 * 🇦🇷 Juan Ignacio Londero
 * 🇪🇸 Pedro Martínez

Withdrawals

 * Before the tournament
 * Borna Ćorić → replaced by 🇺🇸 Tommy Paul
 * 🇺🇸 John Isner → replaced by 🇪🇸 Pablo Andújar
 * 🇷🇺 Daniil Medvedev → replaced by 🇦🇷 Juan Ignacio Londero
 * 🇫🇷 Gaël Monfils → replaced by 🇪🇸 Pedro Martínez
 * 🇯🇵 Kei Nishikori → replaced by 🇷🇸 Laslo Đere
 * 🇺🇸 Reilly Opelka → replaced by 🇫🇷 Jérémy Chardy
 * 🇦🇹 Dominic Thiem → replaced by 🇪🇸 Alejandro Davidovich Fokina
 * Stan Wawrinka → replaced by 🇦🇺 Jordan Thompson

Retirements

 * Nikoloz Basilashvili
 * 🇪🇸 Alejandro Davidovich Fokina
 * 🇪🇸 Pedro Martínez

Seeds

 * Rankings are as of 5 April 2021.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * Romain Arneodo / Hugo Nys
 * 🇮🇹 Simone Bolelli / 🇮🇹 Jannik Sinner
 * Petros Tsitsipas / Stefanos Tsitsipas

The following pairs received entry into the doubles main draw as alternates:
 * 🇰🇿 Alexander Bublik / 🇷🇸 Dušan Lajović
 * Ariel Behar / 🇪🇨 Gonzalo Escobar

Withdrawals

 * Before the tournament
 * 🇩🇪 Jan-Lennard Struff / 🇦🇹 Dominic Thiem → replaced by 🇰🇿 Alexander Bublik / 🇷🇸 Dušan Lajović
 * 🇬🇧 Jamie Murray / 🇧🇷 Bruno Soares → replaced by 🇬🇧 Jamie Murray / 🇩🇪 Jan-Lennard Struff
 * 🇩🇪 Tim Pütz / 🇩🇪 Alexander Zverev → replaced by Ariel Behar / 🇪🇨 Gonzalo Escobar

Retirements

 * Romain Arneodo / Hugo Nys