Emma Raducanu fought back from 5-0 down in the first set to beat Slovenia's Kaja Juvan in the last 16 at the Transylvania Open in Romania.
In her second match since splitting with coach Francis Roig, Raducanu won 11 games in a row on the way to securing a 7-5 6-1 victory.
"Thank you for the support, it really got me through some tricky moments in that first set," said the British number one.
"Kaja was playing some great tennis, was putting me on the back foot straight away.
"I thought I was being aggressive going for my shots but I was missing and not executing.