Princess Anne unveiled the Town Moor course's new 30 million Urban-i stand and toured the grandstands which are back in action following refurbishments which last year saw the St Leger staged in York.
Tony Sockett, Doncaster's civic mayor whose father Joss was a professional jockey who won his first race in 1933, said: "It was a marvellous day and I'm very glad to be back at the racecourse.
"When Her Royal Highness unveiled the plaque to declare the stand officially open it was a very special moment.
"After the plaque had been unveiled, she went on to give a very full account of the pleasure she got from racing and from seeing this historic course opened.
"I did get a chance later to ask if she'd had a successful day but she was very quick to point out she doesn't actually back horses!"
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