I have been playing badminton doubles in a club for 2 years. I always play a good game and give a tough time to the players who were playing against me. In total we are 15 players in the club. We all are good players.
Now my neighbor has started coming to the club. I am 19 years old and he is 27 years old. He is a beginner and always willing to be my partner in games. He doesn't play a good game, I lose games due to him and disqualified for the next game. Many times I've asked him to improve his game, but he doesn't give much effort.
How do I ask him in a polite way to first work on improving his game and play with other beginners?