Chris So Wai-yin has an exceptional young sprinter on his hands with Fabulous One, but on a day when he bagged a treble and even unveiled a prospective Classic Mile runner, the trainer still didn't seem content with his day at Sha Tin.

Boom horse Fabulous One looks headed straight to the upper ranks of a sprint division crying out for fresh blood after yet another dominant display in slick time. Still, So said the speedster still has some work to do if he is to live up to the hype generated through his three straight tearaway victories to start the season.

"Yes, he is very exciting, but he does a few things wrong - that is fine for now, but he won't get away with when he faces the really top horses," said So, who was nevertheless delighted with a day where he won the Class Five opener with Aztec Empire, scored with Classic Emperor and then went close with 2016 classic prospect Hero Look in the last.

"I don't disagree that Fabulous One will be in those group races, but he is going to have to learn to settle and take a sit in a race. He has already come a long way, though, he has improved, and it is exciting that he still has some improvement left in him."

Yes, he is very exciting, but he does a few things wrong ... he won't get away with when he faces the really top horses
Chris So

Jockey Zac Purton was the beneficiary of Joao Moreira's absence through suspension as he picked up the ride on the four-year-old, although he had trialled Fabulous One before climbing aboard for the Class Three - where he somewhat unsuccessfully tried to get the horse to settle behind the speed.

After Fabulous One drew barrier 11, there was no option other than to utilise the horse's electric gate speed in a race without much pace, yet Purton agreed that the son of Elusive City still has to add some different aspects to his game.

"You can't just be one-dimensional, especially here in Hong Kong, but he has time to learn - one day he will have to, though, because he won't be able to lead and have it his own way all the time," Purton said.

"But overall it is pretty positive. He helps himself being good out of the gates, gets to the front and he doesn't overdo it."

Another So runner to use his gate speed from a tricky draw was Classic Emperor, Douglas Whyte dictating terms up front in a Class Three mile.

Three-year-old Classic Emperor, who was second-up after being gelded, arrived with So in an off-season stable transfer from Sean Woods after some decent runs in griffin company last season.

"First-up he had 133 pounds in Class Four and he couldn't muster the pace to cross them," Whyte said. "But with a light weight, drawn wide and with the track on fire we thought we would bounce him out and try and dictate and thought it would take a good horse to beat me."

Italian import Hero Look nearly gave So a four-timer, and Whyte a double, when running Celestial Smile to a head in the last, and beat home the horse it seemed every expert had as nominal 2016 Hong Kong Derby favourite, Thewizardofoz.

"I really liked his 1,600m win in Italy, the class of the race looked good," So said. "As soon as we bought him we gelded him, which turned out to be a good move."