NEVER stay at close range when fighting Mal'Damba, try staying at a confortable distance where he cant easily hit or stun you, and you revolver has the advantage.
if evie is going wormhole, keep track of her location when she blinks. Spam broadside there.. 80% of the time she will blink back, jump in time for the broadside to explode.. killing her instantly...
Using a shock pulse focused loadout, Grohk can frequently slow down and damage groups and even hurt fragile champions behind cover. Use hard shields (Barik, Fernando, Makoa) frequently to protect your team.