If there is a chink in the armour of iron horse Theseo, New Zealand stayer Harris Tweed might be the one to expose it in Saturday's $2.25 million The BMW at Rosehill.The Gai Waterhouse-trained Theseo is the $3 TAB Sportsbet favourite with Harris Tweed on the fourth line of betting at $11.Theseo was runner-up to Fiumicino in the BMW (2400m) last year but has never won at the trip.Neither has Harris Tweed but he did finish fifth to Shocking in the Melbourne Cup (3200m) and Bjorn Baker, who trains

If there is a chink in the armour of iron horse Theseo, New Zealand stayer Harris Tweed might be the one to expose it in Saturday's $2.25 million The BMW at Rosehill.

The Gai Waterhouse-trained Theseo is the $3 TAB Sportsbet favourite with Harris Tweed on the fourth line of betting at $11.

Theseo was runner-up to Fiumicino in the BMW (2400m) last year but has never won at the trip.

Neither has Harris Tweed but he did finish fifth to Shocking in the Melbourne Cup (3200m) and Bjorn Baker, who trains the four-year-old in partnership with his father Murray, has no doubts his charge will be strong at the finish.

"Obviously Theseo is a well-credentialled horse," Baker said.

"But the one thing our guy has is he stays and if it's a true staying test on a wet track, well I'm pretty happy with our guy going into it," Baker said.

The Rosehill track was rated a heavy (8) on Wednesday and with more rain forecast racecourse manager Lindsay Murphy predicted it would be slow at best by race day.

Harris Tweed has proven himself on wet and dry tracks and was an impressive winner of the Tulloch Stakes on the corresponding program 12 months ago, run on heavy ground.

"Because he won the Tulloch on a wet track he's been pigeonholed, people think he's just a wet tracker but in hindsight he would have won the Tulloch against that field if it was rock-hard," Baker said.

"He goes on any type of track, if it's wet it just means it's going to knock out a couple of the others."

Harris Tweed will tackle The BMW at his third run from a spell having finished runner-up at his two lead-up efforts in New Zealand, the latest when he was a length from Vosne Romanee in the weight-for-age Group One New Zealand Stakes (1600m).

He proved he wasn't far off Australia's best stayers beating all but Roman Emperor in the AJC Australian Derby last autumn and finishing just over four lengths from Shocking in the Melbourne Cup.

Baker says the best is still to come.

"He's definitely going better than he's ever gone," he said.

"His form coming over to Australia, for once, is Group One form and he's holding his condition well."

The Bakers are rarely far away when they travel their horses to Sydney.

They won the 2008 AJC Derby with Nom Du Jeu while Baker senior was the trainer of 1992 Sydney Cup and Ranvet Stakes winner My Eagle Eye.

There was also Mr Tipsy who finished fifth in the BMW 12 months ago and third in Ista Kareem's Sydney Cup.

"We've had some fun there the last couple of years so hopefully it can continue," Baker said.

Pending Harris Tweed's run on Saturday, the gelding may stick around for either the Sydney Cup (3200m) or Queen Elizabeth Stakes (2000m), both at Randwick on April 24.

If he can collect one of the features the Bakers will have extra reason to celebrate with Bjorn Baker's wife expecting their first child in the coming weeks.