Monfils converted four out of 11 break points as he denied his 19-year-old Felix Auger-Aliassime a maiden ATP title.
Tokyo Olympics 2020: Indian tennis player Sumit Nagal looking to break into ATP top-80s in quest for spot at Games
Sumit Nagal made it to the semi-final or better of eight ATP Challengers this year, going through to the final twice and winning the title in Buenos Aires
Hamburg Open 2019: India's Sumit Nagal qualifies for maiden appearance in main draw of any ATP 500 tournament
21-year-old Sumit Nagal has been enjoying a good run, having reached the semifinals in five challenger tournaments and getting close to the Top 200 rankings
Monte Carlo Masters 2019: Rafael Nadal storms into round of 16; Alexander Zverev tames teenage senstation Felix Auger-Aliassime
Spaniard Rafael Nadal collected the opening five games of the afternoon in 17 minutes as he set the tone for another dominant display in the principality of Monaco
Rotterdam Open: Russian fifth-seed Daniil Medvedev ends Jo-Wilfried Tsonga's seven match win streak to enter semi-final
Daniil Medvedev outlasted 33-year-old Jo-Wilfried Tsonga in a 90-minute struggle to reach the semi-finals and a meeting with Gael Monfils in the Rotterdam Open.
Australian Open 2019: Ninth seed John Isner knocked out in first round by Reilly Opelka in battle of giants
The 6ft 10in John Isner was beaten by fellow American Reilly Opelka in a battle of the giants in the first round of the Australian Open.
Japan Open: Local hero Kei Nishikori cruises past Benoit Paire; Nick Kyrgios, Kevin Anderson through to round of 16
Nishikori completed a 6-3, 7-5 victory despite late resistance from Paire to avenge a semi-final defeat inflicted by the Frenchman in Tokyo three years ago.
Stan Wawrinka motors along after comeback, but worrying signs about his long-term future hard to ignore
The Wawrinka we have come to admire (and fear) has never been a small-tournament or small-opponent guy. But is that just our spoiled selves talking? Would it really be such a bad thing if Wawrinka never reached another Slam final?
Saint Petersburg Open: 2012 champion Martin Klizan battles back to beat Stan Wawrinka and reach final
Slovakian Martin Klizan fought back from a set down to beat Stan Wawrinka of Switzerland 4-6, 6-3, 7-5 and reach the final of the tournament he last won back in 2012.
Saint Petersburg Open: Stan Wawrinka downs defending champion Damir Dzumhur; top seed Dominic Thiem enters semi-finals
Stan Wawrinka beat last year's St Petersburg champion Damir Dzumhur in straight sets to reach the semi-finals on Friday.
Three-time Grand Slam champion Stan Wawrinka booked a place in the second round at the Saint Petersburg Open with a hard-fought straight-sets win over Slovenia's Aljaz Bedene at Saint Petersburg on Monday.
Kitzbuhel Open: Qualifier Martin Klizan defeats Denis Istomin in straight sets to clinch sixth ATP title
Slovakia’s Martin Klizan beat fellow qualifier Denis Istomin of Uzbekistan 6-2, 6-2 on Saturday to win the Kitzbuhel Open.
French Open 2018 qualifiers: India's Prajnesh Gunneswaran enters second round; Ramkumar Ramanathan bows out
India's Prajnesh Gunnesweran won his encounter while Ramkumar Ramanathan and Sumit Nagal lost their respective men's singles opening round matches at the French Open Qualifiers.
French Open 2018: India's Sumit Nagal bows out of qualifiers after first-round loss to Slovakia's Martin Klizan
Nagal was up against a player, who recently enjoyed a giant-killing spree at the Barcelona Open, defeating Novak Djokovic and Feliciano Lopez.
Munich Open: Alexander Zverev sets up semi-final clash with Hyeon Chung after crushing win over Jan-Lennard Struff
Alexander Zverev, ranked third in the world, needed just over an hour to beat German compatriot Jan-Lennard Struff 6-3, 6-2 in his quarter-final match.
Munich Open: Defending champion Alexander Zverev survives scare against Yannick Hanfmann to reach last eight
Defending champion Alexander Zverev had to dig deep to win his second-round match at the ATP tournament in Munich on Wednesday after a scare against fellow German Yannick Hanfmann.
Novak Djokovic, whose latest comeback in Barcelona last week ended after one match, believes he will improve before Roland Garros.
Munich Open: Former champion Martin Klizan rallies to defeat Florian Mayer to progress to second round
Former champion Martin Klizan rallied to surprise home player Florian Mayer 3-6, 6-4, 6-3 in the first round of the Munich Open on Monday.
Barcelona Open: Rafael Nadal beats Martin Klizan in quarters for his 399th win on clay; Dimitrov, Thiem lose
World number one Nadal was made to work by Slovakian qualifier Klizan, ranked at 140 and who had knocked out Novak Djokovic in the second round.
Barcelona Open: Rafael Nadal brushes aside Guillermo Garcia Lopez; Grigor Dimitrov stutters into quarters
World No 1 Nadal, chasing an 11th title at the tournament, will next face Slovakia's Martin Klizan.