Amir scythed through the Royals top-order with a sensational spell of seam bowling upfront by snaring four wickets in the Powerplay.
Mortaza endured a torrid run in the 50-over marquee event where he managed a solitary wicket across eight games.
'I still have that love for the game and that passion for the game as well. And I would love to carry on as long as possible' - Gayle
Skipper Shanaka scored 75 off 31 before bowlers steamrolled Rangers' batting line-up
Kayes scored 61 off 38 balls whereas Walton made 49 off 30 balls as Challengers won
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Hasan Ali returns to Test side, Pakistan name nine uncapped players for South Africa series
Ben Dunk leaves Melbourne Stars midway through Big Bash League
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Injury-afflicted Rumman Raees roped in as bowling consultant for Islamabad United
Heinrich Klaasen named captain of second-string South Africa squad for Pakistan T20Is
Hasan Ali, Mohammad Nawaz, Imran Farhat among captains named for Pakistan Cup
Umar Gul appointed Quetta Gladiators bowling coach
'Our security guys have said it is safe' - Boucher excited about historic Pakistan tour