Just make sure to have a bow. If you guys are the last three standing, make them come to you, make sure to not build a bridge, and put on nooby armor and hold a stone sword. What they don't know is that your hiding a Punch Bow. Right as they come to build to you, you shoot the first 1 with your Punch Bow and knock him off. After that, the other one probably got the idea that you are OP, so then you get on your good stuff, meet him wherever he is, and then fight a fair fight :)
Hope I Helped!
~OrbitFlash