Most effective way to make the opponent tired in level doubles?

Hello,

Give them easy lifts to smash.. I’m assuming your defence will hold.
Keep lifting and keep taunting them(humorous way).
Smashes and clears drain energy fast. And also tires the shoulder/arm.

Another way is to have a penalty for losing team. It can be a small treat or money or anything so they won’t just throw the match on getting tired.