Venus Williams' hopes of a 50th pro singles championship were put on ice on Sunday at the Bank of the West Classic final.
Williams lost a grueling match to Johanna Konta 7-5,5-7,6-2 at the Taube Family Tennis Stadium, handing the number three seed her first WTA title.
In what was Konta's first WTA final, the Briton she managed to clinch the first set and was quickly leading 4-1 in the second but was let down by a string of errors.
Williams took advantage of Konta's slip and won six of the final seven games in the second set to force a deciding third set.
The 36-year-old Williams, who is the oldest player to make the finals of the tournament since Martina Navratilova did so 22 years ago at the age of 38, looked to be overwhelmed by the younger Konta in the last set.
This was the second encounter this year for both players and third overall. The 25-year-old Konta also ran out winner in the first round of this year's Australian Open.
Williams, who made her pro debut at the tournament at 14, lost in the Bank of the West final for the sixth time, having last won it in 2002.