TOKYO – Tomas Berdych won the Japan Open for his first singles title in 16 months, beating Juan Martin Del Potro 6-1, 6-4 on Sunday.

The ninth-seeded Czech relied on strong serves and solid groundstrokes to beat the Argentine, who won 29 of 30 matches going into the final.

“At this level of tennis, it's important to be consistent,” said the 23-year-old Berdych, who had 11 aces. “I was able to do that all week and am thrilled to win the title.”

In the women's event, top-seeded Caroline Wozniacki defeated fifth-seeded Kaia Kanepi of Estonia 6-2, 3-6, 6-1. It was the Dane's third singles title in three months, having claimed events in Stockholm and New Haven

“She was serving really well in the second set and had the advantage,” said Wozniacki. “I just tried to step it up in the third set and play better on my return and it worked out for me.”

After struggling for much of this season, Berdych said he's starting to get his game back. He reached the semifinals of the Bangkok Open last month.

“In today's tennis everything is so close and tough,” said Berdych. “It's all about having confidence on the court. If you win one or two matches everything can come together.”

Berdych coasted through the first set, then broke to go ahead 2-1 in the second set.

Del Potro fought back, lobbing the Czech to cut the lead to 5-4, but Berdych held serve in the final game to take the fifth title of his career.

Del Potro, seeded fifth, was looking to win his fifth title of the year but got off to a shaky start and wasn't able to recover.

He took some medicine for his stomach during the first set.

“I was a little confused with his game,” said Del Potro. “After the first set, I started to play a little better but it was too late. I didn't have a chance to do anything with his game.”

Berdych defeated second-seeded Andy Roddick in the semifinals to reach Sunday's final. Del Potro had defeated top-seeded David Ferrer in the quarterfinals before advancing to the final with a win over last year's runner-up Richard Gasquet of France.