Czech Tomas Berdych eased past Argentinian Juan-Martin del Potro 6-1 6-4 to capture the Japan Open title on Sunday.

The championship was the fourth for Berdych, who had last won at Halle in 2007.

Berdych got off to a rousing start, blowing through del Potro in the first set.

The second set was more challenging, but Berdych held off del Potro's three attempts to break in the match and finished off his foe in one hour 18 minutes.

The Czech won 27 of 31 points on his first serve, enabling him to control the flow of the match.

Berdych had booked his spot in the final with an upset of Andy Roddick in the semi-finals. The American had Berdych down 5-3 in the final set but failed to close out the Czech, who rallied and took the match in a tiebreaker.

The 12th-ranked del Potro, 20, had never won on the ATP Tour before capturing four consecutive tournaments during the summer, and he followed that with an impressive quarterfinal effort at the US Open.

Caroline Wozniacki won the women's event to capture her third title of the season.

The top-seeded Wozniacki of Denmark emerged victorious with a 6-2 3-6 6-1 victory over fifth-seeded Kaia Kanepi of Estonia.

Wozniacki advanced to championship match with a 6-4 6-3 victory over lucky loser Jarmila Gajdosova of Slovakia on Saturday.

The world number 16, Wozniacki has won all three of her trips to finals this year, having claimed titles at Stockholm and New Haven prior to this.

After failing to make it past the first round in her last two tournaments, the 18-year-old Dane turned things around here, losing only two sets in four matches.

Kanepi advanced to her second career final after dispatching Canadian Aleksandra Wozniak 6-4 6-4 in the semi-finals.