Local hope Kimiko Date Krumm has upset defending champion Samantha Stosur in a final-set tie-breaker at the quarter-finals of the Japan Women's Open tennis tournament.
The 40-year-old Japanese veteran, who won the singles title four times in the 1990s, took two hours and 34 minutes to beat the Australian top seed 5-7 6-3 7-6 (7-4).
Stosur, 26, claimed her first career WTA title last year in Japan, and added another at Charleston this season before reaching her career first Grand Slam final at the French Open.
In the semi-finals on Saturday, Date Krumm will take on third seed Shahar Peer of Israel, who trounced seventh seed Iveta Benesova of the Czech Republic 6-2 6-0.
The other semi-final match will be played between experienced Thai ace Tamarine Tanasugarn and 2006 champion Marion Bartoli of France.
