I Am A Team Leader. My Boss Doesn’t Like The Performance Of One Of My Subordinates And Wants Me To Fire Him. I Think He Can Improve But My Boss Is Not Convinced. What Should I Do?

My boss wants me to fire my junior for bad performance. I think he can improve but boss isn’t convinced. What should I do? Should this be presented as my decision, my boss’, or the company’s?
Source: Today Deals