MONTE CARLO, Monaco (AFP) — World No. 1 Novak Djokovic said his "feeling was great" as he flew past Roman Safiullin in straight sets at the Monte Carlo Masters while third seed Carlos Alcaraz withdrew from the event due to injury.

After receiving a bye in the first round, Djokovic was imperious on the main Rainier III court as he won 6-1, 6-2 against the unseeded Russian.

"My feeling was great," Djokovic said.

"I think… it's been one of my best performances I had here in quite a few years."

"Monte Carlo is the first big tournament of the clay court season. You know, I haven't been really able the last six, seven years to start off strong and start off well. I've always kind of struggled in this tournament."

The Serbian needed just one hour and 10 minutes to make a return to winning ways in his first match since a shock early exit at Indian Wells to Italian Luca Nardi.

The 36-year-old became the oldest world no.1 in the history of the ATP rankings when he took to the court in Monte Carlo, surpassing Roger Federer's record.

"It is nice, it is great," the 24-time Grand Slam winner said.

"I met (Rohan) Bopanna yesterday, who is the oldest doubles no.1 in history. He said we had a combined age of 80, but he does contribute to the 80 more than I do. But it is fun."

But there was no sign of Djokovic feeling his age as he broke Safiullin's serve twice to race into a 4-0 lead in the first set.

Djokovic went on to break his opponent's serve five times over the course of a routine win and now faces a third-round meeting with Lorenzo Musetti, after the Italian ousted rising French starlet Arthur Fils 6-3, 7-5.

Before Djokovic took to court, Alcaraz announced he was pulling out of Monte Carlo after failing to recover from an injury to his right forearm.

"I have been working in Monte Carlo and trying to recover until the last minute from an injured pronator teres (muscle) in my right arm, but it was not possible and I cannot play," Alcaraz wrote on social media.