Brent had touched an intra-day low of $81.05 on Wednesday
The Japanese player, who won here for three years from 1992 and regained the title in 1996, needed two hours and 58 minutes to beat the third-seeded Israeli 3-6, 7-6 (7/5), 7-5 in the semi-finals.
Tamarine, the runner-up in 2001 and the doubles champion with Maria Sharapova in 2003, eliminated second seed and 2006 champion Marion Bartoli of France 6-2, 7-5.
Date Krumm, 40, is on track to become the oldest player to win a tour title, beating Billie Jean King, who won the 1983 Birmingham trophy at 39 years seven months and 23 days.
Tamarine, ranked 94th against Date’s 56th, will fight for her fourth career WTA title.
Brent had touched an intra-day low of $81.05 on Wednesday
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