Pinatubo faces eight in the Dewhurst (Adam Davy/PA)Pinatubo will aim to enhance his already lofty reputation as he faces eight rivals in Saturday’s Darley Dewhurst Stakes at Newmarket.

Charlie Appleby’s juvenile is unbeaten in five races with each performance more impressive than the last.

He has come a long way since making his debut at Wolverhampton in May, winning the National Stakes last time out by an incredible nine lengths.

Aidan O’Brien is in the unusual position of being the underdog for once, but that did not stop him from supplementing Wichita earlier in the week.

Wichita was a seven-length winner of the Tattersalls Stakes and is one of four Ballydoyle representatives along with Coventry Stakes winner Arizona, Monarch Of Egypt, who has been second to Siskin twice this season, and Year Of The Tiger.

Clive Cox runs Positive, second to Pinatubo at Goodwood before lifting the Solario Stakes.

Richard Hannon is represented by Mystery Power, who has won the July Stakes and been second in the Mill Reef this season, while Mark Johnston fields Iffraaz.

The Charlie Hills-trained Royal Commando completes the field.

Conditions on the course had dried out slightly on Thursday afternoon, with the ground described as good to soft.

“We have had only 0.2mm of rainfall since 8.00pm on Sunday evening and have missed the showers that had been forecast during the last three days. All this means that the ground has dried out to good to soft,” said clerk of the course Michael Prosser.

“A weakening front could bring one to two millimetres of rain overnight tonight and there is further rain forecast for tomorrow afternoon, which could bring a further three to four millimetres.

“We are expecting a breezy day tomorrow though, so any showers may move through quickly.

“On Saturday, there could be further rain but timeframes are unclear at this stage and it could be that the front arrives later in the afternoon.”