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Novak Djokovic serves against Kei Nishikori in their first-round match at the Madrid Open on Monday.Clive Brunskill/Getty Images

Novak Djokovic notched an encouraging win in his comeback from a right-elbow injury when he beat Kei Nishikori 7-5, 6-4 in the first round of the Madrid Open on Monday.

Djokovic broke serve late in each set to get past the 20th-ranked Nishikori after nearly two hours in the Magic Box.

Djokovic hasn’t made it to the quarter-final in his previous five tournaments this year, admitting he returned to tennis too quickly. In his past event, he lost in the third round in Monte Carlo, where Nishikori reached the final.

Djokovic was aggressive from the start, hitting 26 winners against Nishikori, who has made at least the Madrid quarter-final for the past five years. He was a finalist in 2014, losing to Rafael Nadal.

“The draw was such that we had to face in the first round, which is a bit strange,” Djokovic said. “But it was a good opening match.”

Maria Sharapova, who won in Madrid in 2014, made it to the last 16 by defeating Irina-Camelia Begu 7-5, 6-1 in only her second match since the Australian Open. She has been dealing with a left-forearm injury.

“It was a lot of hard work,” Sharapova said of her match. “Being down a break to start off both of those sets didn’t make things easy for me. That will certainly help me moving forward.”

Australian Open champion Caroline Wozniacki edged past Ashleigh Barty 6-2, 4-6, 6-4. Wozniacki reached the 2009 final on debut and hasn’t been close since.

“I was lucky to get away with it in that third set,” the second-seeded Wozniacki said.

Milos Raonic defeated Nicolas Kicker 6-3, 6-2 to set up a second-round encounter with third-seeded Grigor Dimitrov, while Richard Gasquet beat Tomas Berdych 6-4, 6-2 to advance to play qualifier Dusan Lajovic, who got past Karen Khachanov 6-3, 6-2.

In a first-round match between Frenchmen, Benoît Paire hit 39 winners to defeat 18th-ranked Lucas Pouille 6-2, 6-3, advancing to face 19-year-old Denis Shapovalov of Canada, who got past Tennys Sandgren of the United States 6-1, 6-4.

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