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Nadal endured a poor first set, losing five of the last six games, but turned things around in impressive style, spending two hours and 47 minutes on the court.

The 10-time Italian Open champion saved all five break points he faced in the second and third sets to take key points and earn a seventh win of the season.

Nadal is competing in his third consecutive tour-level event after missing most of last year due to a hip injury that required surgery before his comeback was halted by a muscle tear in January.

"That was not my best match, I was practising better than I played today, but I found a way to win," he said after the match.

"That’s so important at the beginning of the tournament. My game is more unpredictable than before. I didn’t play much tennis for the last two years, so have some ups and downs, on and off, but I think I can do much better than today and I hope to do it next round."

The Spaniard will face seventh-seeded Hubert Hurkacz in the second round.