After finishing the normal season in fourth place, the newly promoted Millers recorded a 4-2 aggregate semi-final victory over Preston North End to reach Wembley, where they are 13/10 (2.30) favourites with William Hill to come out on top.
Russell Slade's men surprised everyone by leading the league for most of the first half of the season before falling away into third place and are now 21/10 (3.10) underdogs to secure promotion with a victory in the final.
Only one of the last seven League One play-off finals have gone into extra time but you can get odds of 3/1 (4.00) on this one remaining all square after 90 minutes.
With all due respect to beaten semi-finalists Peterborough and Preston, it is probably fitting that the final will be played out between the teams who finished equal on points in third and fourth place.
With only champions Wolves hitting the back of the net more times than this pair in the regular season, the Os finished ahead of their opponents by virtue of a better defensive record, although this is sure to be tested against Steve Evans's men.
April's 6-4 defeat at Molineux was a prime example of Evans's adventurous approach to the game, with the Scot seemingly always confident that his team can score more than the opposition.
Considering that the finalists have failed to score just 12 times in 96 League One games between them so far and with only three clean sheets to their name in the previous 20 combined fixtures, odds of 7/10 (1.70) seem like a no-brainer on both sides finding the net when they come face to face.
With nine goals to his name in the last 11 matches, Kieran Agard poses probably the greatest threat to Orient's back line and is well worth backing at 6/5 (2.20) to hit a 27th goal of the season, particularly given his responsibility from the penalty spot.
|Both teams to score for a 2pt stake at 7/10 (1.70) with William Hill
||Kieran Agard to score anytime for a 1pt stake at 6/5 (2.20) with William Hill
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Al Hain-Cole is an experienced tipster and avid follower of European football. He specialises in accumulators and if you would like to read more from Al you can follow him on Twitter here.