Rovers are 7/5 to beat Sunderland on December 29 with title partners Sky Bet.
Kieran Sadlier scored twice in the Boxing Day victory at Peterborough United in Sky Bet League One, and he is 13/2 to open the scoring at the Keepmoat Stadium.
Sunderland are below Rovers in the table on goal-difference, and are priced at 17/10 for a victory on the road. The draw is available at 23/10.
All odds correct at the time of writing. Over 18s only. Please gamble responsibly and Be Gamble Aware. www.begambleaware.org.