The Royals scored 54 runs in their last three overs and that turned out to be a decisive factor.
Shoaib Malik and Andre Russell have proven their worth with bat and ball throughout the tournament.
In the Qualifier 1, Mohammad Amir's six-wicket haul blew away the Royals.
Dre-Russ' heroics has shown Chattogram Challengers the door of elimination.
Both sides have got enough ammunition in their batting unit. Hence, opting for the likes of Chris Gayle, Shoaib Malik as captain/vice-captain can be a good punt.
The Royals will be looking for a better show with the bat in order to roll over the Challengers.
Shoaib Malik tried to pull off a single-handed effort with a 50-ball 80, but he didn't get much support from the others.
Shadab Khan scored a 41-ball 64 and picked up Chris Gayle and Imrul Kayes' wicket. But his efforts went in vain.
Rilee Rossouw is expected to replicate his influential form with the bat in the next match for his side.
It's a chance for both sides to qualify for the Final.