In spite of trainer Jeremy Noseda's concern that his charge would find the softer conditions in Berkshire not to his liking, Sans Frontieres is now set up well for the St Leger event next month, after winning the CGA Geoffrey Freer Stakes at Newbury.
The colt also had the leap to nearly a mile and three quarters to deal with, after finding his form in the Princess Of Wales's Stakes at Newmarket in his last start.
Sans Frontieres, with the expert guidance of Johnny Murtagh, proved Noseda's concerns to be groundless as he defeated Laaheb comfortably by two and a quarter lengths, with Saptapadi back a further length and a quarter in third place.
The race favourite, Kite Wood, who won the event last year, led the field up to the final three furlongs then faded away.
"To be honest I was very worried about the ground but I chatted to Sir Robert and we decided to go for it," said Noseda.
"I was fairly worried he wouldn't go on it, but we had to find out today because we've had the Irish St Leger on our minds and there's a good chance it will be soft there.
"So it will be the Irish St Leger next and hopefully after that, we can have a tilt at the Melbourne Cup."
Jockey Johnny Murtagh said, "He pricked his ears a little because of the noise of the crowd but the increase in distance definitely helped.
"I was supposed to ride in a jockeys' competition in France today but Jeremy rang me up and said he had a couple of good rides for me. It was worth coming."
Regarding Kite Wood, jockey Frankie Dettori said, "He was beaten a long way out so something was definitely wrong there."