The 13-year-old from Felixstowe Ferry scored four-over par 76. She finished one shot ahead of a group which includes the defending champion Kelly Tidy (Manchester) and the 2006 English U13 champion Alex Peters (Notts’ Ladies).
Afterwards Heidi remarked: “I was pleased overall. I played the front nine well but made too many bogeys on the back nine. But that’s golf isn’t it!”
She added: “It’s lovely conditions, really sunny and calm and it’s a very nice course.”
Heidi, who plays off four, is a Suffolk first team player and won the South-East of England schools’ championship earlier this season.
After tomorrow’s second round the field will be cut to the leading 36 players and ties who will play the final 36 holes of the championship on Thursday.
Leading scores: 76 Heidi Baek (Felixstowe Ferry). 77 Miranda Brain (Gog Magog), Hayley Davis (Ferndown), Alex Peters (Notts Ladies), Kelly Tidy (Manchester). 78 Jessica Bradley (Tiverton). 79 Sophie Godley (Renishaw Park), Helen Searle (West End). 80 Bronwyn Davies (Wolstanton), Charlotte Thomas (West Surrey).
Full scores: www.englishladiesgolf.org