Wigan coach Frank Endacott is aiming to turn the battle for Super League's top spot into a two-horse race with the elimination of one-time favourites the Bulls tomorrow.

The Warriors have taken three points from their meetings with the Bulls already this season and they will be aiming to make that five when the titans clash for a third time.

The eagerly-awaited encounter, which is expected to draw a JJB Stadium record crowd of up to 20,000, is the first of two Roses clashes in six days that will do much to determine the final shake-up among Super League's big four.

While a Bradford victory will enable them to go above the Warriors on points difference, St Helens could be the big winners as long as they see off lowly Salford ahead of their big test at Leeds on Friday.

"It's really our season in this one game," said Endacott. "If we win, we go four points ahead of Bradford and it's down to us and St Helens for top spot."

Bulls' former Wigan star Henry Paul admitted: "It is a must-win game for us. Wigan will go four points clear of us if the unexpected happens and we lose to them.

"We lost to them at Odsal and that still rankles with us. We know where we went wrong that evening and we have been working hard to put things right."

The Bulls, with tricky games coming up against Yorkshire rivals Leeds, Halifax and Hull, can least afford to lose tomorrow but they will carry the rare tag of underdogs following their 30-18 home defeat by Wigan two months ago.

The Wigan pack mastered the Bulls' six that day and also gained a moral victory from the sides' earlier 12-12 draw at the JJB Stadium.

It is no wonder that captain Andy Farrell believes his team have got the measure of the Bulls.

"Bradford are a very intimidating team and sometimes you've got to stand up to some sides," said Farrell. "I think we have the respect of Bradford."

The Bulls, at one time tipped to go through the season undefeated, have dropped five points in their last eight games and suddenly look vulnerable.

But while acknowledging a fall-off in the Bulls previously exceptionally high performances, Endacott is expecting a do-or-die effort from Matthew Elliott's men.

"They will be up for this one," he said. "They are still hurting from their loss at Odsal and they performed very well against us in the 12-all draw here."

Wigan will be virtually at full strength, with scrum-half Willie Peters back after a hamstring injury, and Endacott admitted: "I have dilemmas at hooker, half-back and lock forward."