Anne Keothavong says Great Britain's victory over France in the Billie Jean King Cup is "certainly up there" with her greatest achievements as captain.
Katie Boulter and Emma Raducanu's wins on Saturday saw Britain wrap up their qualifying tie 3-1 and book their place in November's 12-team Finals.
It is the first time Great Britain have earned a spot in the Finals by right, having qualified as hosts in 2021.
Keothavong said it was a "huge milestone" to beat favourites France.
"I'm still in a bit of disbelief. The performances today from Katie and Emma were just incredible, they should be so proud of themselves," Keothavong said.