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What he lacks in size Sireeze makes up for in ability and toughness.

The pint-sized gelding with impeccable breeding pressed his claims for the WATC Derby with an impressive win in yesterday's Swisse Vitamins Handicap (1400m) at Ascot.

Sireeze is by top sire and international Group 1 winner Choisir out of Westerly Breeze, who won the WA Oaks (2400m) in 2007 and ran third in the Perth Cup (3200m) in 2008.

Backed from $5.50 to $4.40 yesterday, the three-year-old capitalised on a perfect run just behind the leader to overhaul Soaring Lad ($16) by half a length. Trading Day ($8.50) ran on to finish third.

In-form trainer Sharon Miller will set Sireeze for a rematch with impressive three-year-old Express Service in the $80,000 TJ Smith Trophy (1600m) at Ascot on Saturday week.

Sireeze ran third to Express Service in the Magic Millions Perth 3YO Trophy (1400m) last Saturday week. Express Service backed up seven days later to win the Challenge Stakes (1500m).

Miller hopes Sireeze has the staying ability of his dam as he heads to the $400,000 WATC Derby (2400m) at Ascot on April 20.

"We'll head that way and see how far he gets," Miller said. "We'll put him back up to the mile (1600m) next start and see if he stays.

"He's probably bigger than his mother - she was tiny."

Miller hopes her punt on the gelding at the Magic Millions Perth yearling sale two years ago pays off. She overlooked his small stature to purchase him for $50,000.

·Jockey Yannick Valenti faces a stewards' inquiry tomorrow into a prohibited substance being found in a urine sample taken from him at Ascot on February 9.

Valenti was banned for six months in November 2011 when he tested positive to methamphetamines. The term was reduced by six weeks after he provided clean swabs and attended counselling.