Quick Brown Fox, the only unbeaten runner in Saturday’s World Sports Betting Fillies Guineas, came in for further support yesterday. The sponsors opened her at 8-1 and she is now fourth favourite at 6-1.

But she has never been further than 1 200m and neither her trainer nor her jockey know how good she actually is even though they both rate her highly.

Greg Cheyne said: “She had always shown us a lot and we were very impressed with her maiden win. It was after that race that Brett Crawford told me we would have a go at the Fillies Guineas if she won the next time – which she did.

“She has an incredible stride and that is her biggest attribute but she does it all so effortlessly and she can really quicken. I am happy with the extra distance – she is not a speed merchant and she is so switched off – but she is still an unknown quantity. Although she is in at the deep end she has made great improvement since her first run.”

Crawford, who won the 2005 Cape Fillies Guineas with Bad Girl Runs, added: “We were always hoping with her and it was a good start when she won on debut, even more so when she won again. If she hadn’t won that day I wouldn’t have run her on Saturday but from a one draw we are taking our chance. She has a lot of speed in her pedigree but I think she will like the extra distance.”

By Michael Clower