The National Academy, which is for players aged 13-18, currently has 10 trainees.
Players spend at least two years at the centre at Loughborough University.
Daniella Britton, who is ranked 358th for world under-18s, said she was excited to be selected at her second attempt.
She said: “I’ve definitely had to work hard for it, it’s not just come easy.
“I can just push my dream of being a top tennis player now.”
Grace Watson said: “I’ve been working very hard to get the opportunity to go there.
“The dream is to be the best tennis player I can, win a few Grand Slams of course.”