( CNN ) -- Japanese veteran Kimiko Date Krumm has reached the Japan Open final with a 3-6 7-6 ( 7-5 ) 7-5 victory over third seed Shahar Peer of Israel in Osaka . Krumm became the oldest woman to beat a top-10 player on the WTA Tour when she defeated Australia 's Sam Stosur on Friday . Now the unseeded 40-year-old , who came out of retirement in 2008 , is in line to replace Billie Jean King as the oldest player to win a WTA singles title . Twelve-time grand slam winner King was 39 years , seven months and 23 days old when she won her last WTA Tour title back in 1983 . `` Considering my age and the years I was away from the tour , I would say this is a miracle . I just hope that my physical and mental health will last one more game , '' Date Krumm said , BBC Sport reported . Date Krumm will play 33-year-old Tamarine Tanasugarn from Thailand in Sunday 's final . The finalists combined age of 73 years makes it the oldest final in WTA Tour history , according to WTATour.com . Meanwhile , Ana Ivanovic made it to her first final in 19 months after she defeated Italy 's Roberta Vinci 6-3 7-5 in the semi-finals at the Generali Ladies Linz event in Austria . The Serb , who was handed a wildcard entry for the tournament took just 70 minutes to overcome Vinci . She will face Switzerland 's Patty Schnyder in Sunday 's final . Schnyder , who had to save two match points in her semi-final , eventually overcame German sixth seed Andrea Petkovic 6-2 4-6 7-5 in two hours 15 minutes .
Kimiko Date Krumm makes Japan Open final after beating third seed Shahar Peer . Hide Caption 1 of 9 Photos:Photos: Japan's women's tennis champions Ana Ivanovic reaches first final in 19 months at Generali Ladies Linz event in Austria .