Jim Cassidy has an extra incentive to win his fourth Group One Queensland Derby on Saturday at Eagle Farm."I want to win it for my old mate Rogie," Cassidy said, referring to Bid Spotter's trainer Graeme Rogerson."He's been a mate of mine since I started riding when I was 16. He's been there for me from day one."At 46, Cassidy has had a roller-coaster life as a jockey, embroiled in controversy over the "jockey tapes" affair in the 1990s, while he's also endured a horror run with injuries and ope

Jim Cassidy has an extra incentive to win his fourth Group One Queensland Derby on Saturday at Eagle Farm.

"I want to win it for my old mate Rogie," Cassidy said, referring to Bid Spotter's trainer Graeme Rogerson.

"He's been a mate of mine since I started riding when I was 16. He's been there for me from day one."

At 46, Cassidy has had a roller-coaster life as a jockey, embroiled in controversy over the "jockey tapes" affair in the 1990s, while he's also endured a horror run with injuries and operations.

He is one of an elite group of jockeys to have won the four major races on the Australian calendar - the Melbourne Cup, Cox Plate, Caulfield Cup and Golden Slipper.

Affectionately known as "The Pumper", Cassidy is riding in career-best form having claimed three Group Ones during the Sydney autumn carnival.

His wins at the elite level were in the AJC Australian Derby on Roman Emperor for Bart Cummings and the George Ryder and Doncaster on the Joseph Pride-trained Vision And Power who is owned by Nick Moraitis, another loyal Cassidy supporter.

Cassidy is looking for his fourth Queensland Derby aboard Bid Spotter following his previous victories with Handy Proverb (1986), Bravery (1988) and Yippyio (1997).

Cassidy dislikes comparing gallopers of different eras but has no doubt Bid Spotter has the potential to be a Cups horse in Melbourne during the spring.

Rogerson's filly Awesome Planet will also line up in the Queensland Derby following her fifth to Purple in last week's Group One Queensland Oaks (2400m) at Eagle Farm.

"It was a good run from the filly but I don't think she'll beat Bid Spotter," Cassidy said.

"I think Bid Spotter is an improving horse with the potential to go on to the spring races.

"He keeps going up a notch every start."

The beautifully-bred Bid Spotter, who cost $850,000 as a yearling, is by Redoute's Choice out of the Sir Tristram mare Isolda.

Rogerson trained Isolda to win the 1995 Champagne Stakes in which she beat Octagonal after finishing second to him in the AJC Sires' Produce Stakes.

"He (Bid Spotter) has turned the corner ever since he was gelded," Cassidy said.

Bid Spotter has started 12 times and took his record to four wins when he scored on a heavy track at Randwick on May 23.

"He's won on a heavy nine in Sydney but they'll be up to their guts in it in this Derby," Cassidy said.

Rogerson believes Bid Spotter is still on the way up and has few reservations about him coping with 2400-metres for the first time.

"Until they run it you never really know but he gives every indication he'll run the trip and his mother did it," Rogerson said.

"He goes in the wet or dry so the track doesn't worry me but this track is going to be real testing on Saturday.

"Jim rode Awesome Planet on Tuesday morning and he thinks she's got a good chance as well.

"She was unlucky in the Oaks and got hammered early but still made up a lot of ground."