Winx's co-owner Peter Tighe has a share in the Chris Waller-trained three-year-old Tough Larry and the gelding races his blue and white silks.
His other owners include members of the Hughes and Callander families who have been touched by brain cancer and are active in raising money for research and awareness.
Former Channel Nine boss of NRL, Matt Callander, died last year aged 47 and Wednesday's winner was named as a tribute to his nickname Larry.
Ridden by James McDonald, Tough Larry ($4.80) beat his stablemate Voila ($5) by a half neck with another stablemate Altair, a $3.70 equal favourite, a further half neck third in the 1150m maiden on the Kensington track.
“Larry was the nickname of my son Matt,” Callander's father, respected racing identity Ken Callander said.
“The Winx colours make it special with Peter Tighe in the ownership.”
Former NRL player Mark Hughes was diagnosed with brain cancer in 2013 and established a foundation in his own name.
Tough Larry's jockey James McDonald said the gelding had a bright future.
“He is a very kind and very willing and has matured mentally,” he said.
At the other end of the experience scale, seven-year-old Prince Mayted has staked a claim for The Kosciuszko with his 1000m win on Wednesday.
It was the ninth win for the 48-start veteran who has also recorded 20 minor placings.
“There's a real nice race coming up worth $1.3 million,” Prosser said.
“We just need a slot now.”
Tickets are on sale through TAB outlets and 12 will be drawn on September 14 with the winners to negotiate with the connections of horses they nominate for slots in the Kosciuszko field.