There's been no stopping top apprentice Matthew Chadwick and he looks the one to beat in the Jockey Challenge at Happy Valley tonight. Chadwick was posted the 4.0 favourite, just ahead of Zac Purton at 4.5, when markets opened yesterday afternoon and, if Chadwick can continue to make something of his lesser rides, that price looks good value. The apprentice managed to squeeze vital points out of minor placings on the weekend with Little Big Boy and Perfect Fit in races where he didn't look a serious player on paper. That is the key to continued success in the Challenge as the good rides tend to take care of themselves and Chadwick is getting plenty of those these days. Tonight's line-up sees him with strong chances in the last five races, three of them for Tony Cruz, who has shot out of the starting gates this season like Silent Witness. Those late rides may prove enough to carry him home, but Chadwick's knack for getting minor points from the types of rides he has earlier - Super Special (race one) and Karbridge (race three) - could see him a red-hot favourite by the time the second half of the card comes around. By then, Purton's supporters will already know their fate as his serious opportunities run out at race five with Amityship. Douglas Whyte's backers were offered value odds at 6.0 - he is missing from two races - but picking up the promoted reserve Master Dreamer in race four has boosted his chances by one and he is a serious player yet again.