The Australian, the 1991 champion, saw his ball fly right across the neighbouring 18th fairway and career out of bounds more than 100 yards left.
Baker-Finch, who has not made a cut all season, reloaded in embarrassment and eventually started his round of 77 with a six.
His playing partner, Wolverhampton's Peter Baker, who shot a two-under- par 70, said: "Ian just seemed to lose balance in his swing. He sort of slipped and it must have been a terrible moment for him."Reuse content