British number one Johanna Konta was beaten in her first match since March as Jodie Burrage caused a shock at the Battle of the Brits on Monday.
Konta, ranked 14th in the world, was understandably far from her best and lacked fluency in a 6-4 6-3 defeat.
Burrage, 21, has reached the final in two LTA tournaments recently and looked sharp in a confident performance.
"It feels amazing to win against such a great player. I feel overwhelmed," said the British number seven.
"I was surprised how I played. When I found out I was playing her I was nervous and didn't want to get hit off the court.