For many years I have tried to describe the great cricketer Ian Botham ("Beefy" Botham) to other people in my international language school. I try to think of a word to describe someone who always makes his team win even when other people team are not very good. I want this word to describe "Beefy" or maybe Michael Jordan in basketball, or Ronaldo in football. Can you help me please?
Some possible ideas for you:
A go-to player:
She's the team's go-to player [=she is the player that the team relies on] when they need to score late in the game.
You can also simply state that X is a most important player (MIP) or most valuable player (MVP) for the team.
The teams that rely heavily on one man to win a match are called one-man teams:
With Neymar gone, suddenly Brazil’s ‘one-man team’ lacks a man. (source)
You can say that Ian Botham carries his team.
Anchorman: A man who plays the most crucial part or is the most dependable contributor.
I'd suggest, wunderkind, boy wonder, and whiz kid
: a person of remarkable talent or ability who achieves great success or acclaim at an early age.
[German : Wunder, wonder, prodigy (from Middle High German, from Old High German wuntar) + Kind, child; see kindergarten.]
: a young man whose skills or accomplishments are precocious. [1960–65; perhaps fashioned on German Wunderkind]
: Informal. a youthful and exceptionally intelligent, talented, or successful person. [1940–45]