Novak Djokovic got off to a good start at the Madrid Open with a 6-3 6-2 win over Gael Monfils in the second round.

World No.1 Djokovic, looking to regain his best form ahead of the French Open, saved all five break points he faced on Tuesday and converted the three he had against the 21st-ranked Frenchman.

That summed up a match in which Djokovic looked rusty, but was either able to raise his game in the key moments or, as often, watch Monfils commit a error.

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Perhaps the Frenchman simply did not believe he could win as this was his 18th straight defeat to Djokovic. It is the worst record against a single opponent without winning in the Open era.

The match was interrupted at 2-2 in the first set as rain forced the roof on centre court to be closed.

Djokovic had needed three sets in each of his last three victories this season, all in Serbia before losing the final there to Andrey Rublev. He lost to Alejandro Davidovich Fokina in his only other clay court match this season, in Monte Carlo.

Djokovic, a three-time winner in Madrid, next faces either former No.1 Andy Murray or Denis Shapovalov.

Earlier, Rublev reached the third round after rallying to a 2-6 6-4 7-5 win over 20-year-old Jack Draper of Britain. Rublev found himself 3-0 down in the decider but Draper then suffered from cramp.

Rublev is seeking his first Masters 1000 title. The win in Serbia last month added to his titles in Dubai and Marseille. Only Rafael Nadal and Carlos Alcaraz have also won three titles this season.

Marin Cilic defeated Albert Ramos-Vinolas 6-3 3-6 6-4, while Americans Frances Tiafoe and Jenson Brooksby lost their first-round matches in straight sets to Cristian Garin and Roberto Bautista Agut respectively.

Nadal, returning from injury, starts his Madrid Open campaign on Wednesday. The only Australian in the draw, Alex de Minaur, plays his second round match with Jannik Siuner on the same day.