Roger Federer took "a lot of confidence" from his four-set win over Marin Cilic as he produced his best display of the year at the French Open.
The 39-year-old beat the 2014 US Open champion 6-2 2-6 7-6 (7-4) 6-2 on Court Philippe-Chatrier on Thursday, building on his first-round defeat of Denis Istomin with an impressive performance.
Federer looked in command in the first set but lost rhythm in the second amid sharpened play from Cilic and a strange confrontation with the umpire after a time violation warning while receiving serve.
The match was on a knife-edge heading into the third-set tie-break, but Federer was clinical when it mattered, serving out the set with an ace before assuming control again in the fourth.
"[It was a] very good match for me, I thought," said Federer, who will face Dominik Koepfer in round three. "A bit of up-and-downs in the second and third sets.
"The good thing, I feel like I come out of a match like this and I know why it was up and down, and then that I was able to attain a solid level once he did break back in the third set and things were looking dangerous for me.
"That I was able to step up a gear, stay with him, and then pull away from him, I think that gives me a lot of confidence."
DJOKOVIC AND NADAL IN CRUISE CONTROL
World number one Novak Djokovic is another who is finding his feet on the Paris dirt, the 2016 champion beating clay specialist Pablo Cuevas 6-3 6-2 6-4.
Djokovic, who will face Ricardas Berankis next after his win over James Duckworth, struck 31 winners as he moved to 22-3 for the year with his 350th grand slam match win.
"I'm playing well, feeling great. I'm ready to go deep in this tournament," he said. "Hopefully, that's going to be the case."
Defending champion Rafael Nadal was in imperious form in the late match, dispatching Richard Gasquet 6-0 7-5 6-2.
Nadal, who turned 35 on Thursday, won the opening seven games in under half an hour in a largely one-sided contest as he improved to 17-0 against the Frenchman, the most one-sided head-to-head of his career.
The Spaniard, who has not even dropped a set to Gasquet since 2008, said of winning once again in three: "I honestly don't complain at all! The main thing for me is to feel myself play well.
"In theory, it's better to save some energy, but at the same time, sometimes when you are pushed at the beginning of a tournament, you went through some tough moments, that helps a lot for the next rounds.
"It happened for me in Rome like this. I had some tough challenges at the beginning of the tournament, and then you get to the quarters, semis and final and you know you're going to suffer and you're more ready for the situation."
MONFLIS OUT, KWON EYEING SLICE OF HISTORY
Cameron Norrie continued the British interest in the French capital, recovering from a set down to defeat Lloyd Harris and reach round three for the first time, and will face Nadal next.
In a mixed day for the seeded players, Diego Schwartzman and Matteo Berrettini advanced in straight sets while Jannik Sinner beat compatriot Gianluca Mager 6-1 7-5 3-6 6-3.
However, Australian Open semi-finalist Aslan Karatsev was beaten in four sets by veteran Philipp Kohlschreiber, while 21st seed Alex De Minaur lost in four sets to Marco Cecchinato.
There was also disappointment for home favourite Gael Monfils. The 14th seed was beaten 6-0 2-6 6-4 6-3 by Mikael Ymer, the world number 105.
However, Thursday saw a moment to remember for Kwon Soon-woo, who reached round three of a major for the first time with a straight-sets victory over Andreas Seppi. He is bidding to become the first South Korean player to get to round four at Roland Garros.
There were impressive wins as well for teenagers Lorenzo Musetti and Carlos Alcaraz Garfica, who beat Nikoloz Basilashvili in straight sets to secure a meeting with Jan-Lennard Struff.