Bryan Guy is hoping the wet track bloodlines of three-year-old Polynikes come into play if the predicted heavy rain hits Doomben on Saturday.

Polynikes is on the second line of betting for the Greenslopes Paediatrics Handicap after an impressive third in similar company two weeks ago.

Guy is confident Polynikes will be hard to beat over Saturday's 1600m journey.

"I have always had an opinion of this horse and I actually gave him his first ever run in a Listed race," Guy said.

"He has drawn much better on Saturday in barrier one and with (apprentice) Janette Johnson's three kilo claim he gets into the race very well at the weights."

Polynikes was an excellent second to Glorious Red over 1600m at Doomben at his only previous attempt at the distance.

He has never been tested on a wet track but the colt has a pedigree that suggests he will handle it.

"His sire Hidden Dragon is getting a reputation for getting wet track winners and his dam Athena Mana Mou won on a wet track at Doomben," Guy said.

"On his breeding he should handle wet tracks."

Guy will also saddle up unlucky filly Stroak in the three-year-old race with apprentice Cassandra Schmidt to ride.

She has drawn the outside barrier in 17 but has proven she can handle rain-affected tracks.

"At least Stroak has won and been placed on a soft track and maybe if it rains being drawn wide won't be so bad," Guy said.