It sounds like you've been challenged to a 1vs1 match in Team Deathmatch (TDM) mode in PUBG!
Here's a possible description for the match:
"1VS1 TDM SHOWDOWN!
My opponent, [Name], has challenged me to a 1vs1 TDM match in PUBG! It's going to be a intense battle of skills, strategy, and a little bit of luck. Who will come out on top? Join me live to find out!"
Feel free to modify it to fit your needs, and good luck in the match!