Caroline Wozniacki (picture, right) outlasted Agnieszka Radwanska 4-6 7-5 6-4 in a dog fight of a semi-final at the Pan Pacific Open yesterday to end the Pole’s reign at the Ariake Coliseum.

The former world number one prevailed in two hours and 50 minutes of hard-fought tennis and will meet Naomi Osaka in today’s final after the local wildcard rallied to secure a 1-6 6-3 6-2 over Ukraine’s Elina Svitolina in the second semi-final.

World number four Radwanska served for the match in the second set but then lost five straight games as Wozniacki levelled up the contest and took an early break in the decider.

There were 13 breaks of serve in the topsy-turvy encounter, however, and it was not until a fourth match point, which Radwanska slapped into the net for her 43rd unforced error, that the Dane was certain of her place in the final.

“I think every time I play her we play really tough matches,” Wozniacki said in a courtside interview.

“She played really well today and I was lucky to win that second set and then we just fought really hard, both of us, in the third.”

Languishing at 28th in the world rankings after a string of injuries, Wozniacki reached the semi-final of the US Open earlier this month and should be confident of clinching her second title in her third Pan Pacific Open final today.

The 18-year-old Osaka continued to build on her momentum in the third set, breaking Svitolina twice on her way to knocking out the world number 20 as she reached her first Pan Pacific Open final.

Today’s contest will be the first meeting between Wozniacki and Osaka.