Champion mare Black Caviar has won the Group One Goodwood at Morphettville, extending her unbeaten record to 21 wins to seal her booking at Royal Ascot next month.

Nolen to beat We're Gonna Rock by a length and a half with the jockey easing her to the line after taking the lead early in the race.

Neither Nolen nor trainer Peter Moody were concerned she did not win by a big margin.

"She was never out of second gear," Nolen said. "I'm not a punter. I don't worry about margins.

"As long as she bloody wins I don't care."

Moody was happy with her performance ahead of her assault on UK racing at Royal Ascot next month.

"Luke looked after her," Moody said. "He was kind and we're happy where we're at.

"No-one's ever given us any more for winning by big spaces.

"As long as she pleases us the next three weeks we're on the plane to England."

Black Caviar is booked to leave Australia on June 7 for Newmarket where she will be prepared for the Diamond Jubilee Stakes at the Royal meeting on June 23.