Nicky Henderson's rich vein of form continued as My Petra ran out a comfortable winner of the bet365 Best Odds Guaranteed Mares' Hurdle.

Second in the Grand Annual over fences at the Cheltenham Festival last March, her class shone throughout as she always looked the most likely winner.

Blaeberry and Theatre Belle looked to hold chances before the final flight but Richard Johnson was still to ask for an effort and she soon shot clear to win by four lengths.

"I've a good record when I ride for Mr Henderson and he always seems to put me on a winner or two," said Johnson.

"On her form in finishing second at the Festival last year she had the best form in the book.

"It stood her in good stead for a race like today."