It may not be quite as bad tonight, as the Bunbury track in provincial West Australia is 160m larger than Gloucester Park at 960m, with Purdon equating it to Cambridge in size and style of racing.
"The bigger track will help for sure," said Purdon. "But I also think last Friday's race will have brought him on a bit fitness-wise.
"He hadn't had much fast work before that heat because he raced in the NZ Cup 10 days earlier and has then done a lot of travelling.
"In his general wellbeing and everything he seems great, so I expect him to go better. But again it looks like we are going to have to sit parked outside a good stayer in Tiger Tara.
"So while I think we can win, I reckon it will be close."
Tiger Tara has had an even busier time than Lazarus, finishing third in the NZ Cup a fortnight ago before a close second in the NZ Free-For-All three days later, travelling to Perth via Sydney and Melbourne then pushing Lennytheshark hard when second in his heat last Friday.
"He must be an amazing horse [Tiger Tara] to cop what he has been doing with all the travel and the racing, so he will be hard to beat," Purdon said.
Lazarus has never lost two races in a row and if he does tonight then he will almost certainly lose favouritism for the series.
But Purdon says that is not an issue for him.
"Sure I want him to win all the time and I realise his fans do too, but the draws over here are so important there is only so much you can do.
"Like the other night, when Soho Tribeca got such an early lead we were always racing for second.
"This time I am sure we will be parked and trying to get right up alongside Tiger Tara, but these are still heats and I won't be pulling the whip and going head-to-head with him for the last lap.
"It is a busy week and we have another heat on Friday so our job is to get a lot of points, win the races we can and then next week have a good build-up to the final."
That worked last season for stablemate Smolda, but the reality is this year's top five in the series are stronger so the barrier draw for the A$1.1 million final could decide the race.
Tonight's three heats are earlier than last Friday's for New Zealand harness fans, with the first — featuring Lennytheshark against a moderate bunch — at 10.45pm NZ time.
Have Faith In Me will be Purdon's rep in that heat but he looked disinterested last Friday and Purdon has swum him since to try to turn him back on mentally. But he looks a shadow of what he used to be.
The second heat could decide the favourite for the final, with local flyers Soho Tribeca (barrier six) and Chicago Bull (one on the second line) both hugely impressive winning their opening night heats.
Second round
• The second round of Inter Dominion heats moves to Bunbury in West Australia tonight.
• The three heats will be held between 10.45pm and 11.47pm, NZ time.
• Kiwi pacing hero Lazarus was thrashed on the opening night and faces another tough barrier draw tonight.
• The next round of heats in back at Gloucester Park in Perth on Friday.
