This goal against Italy is the apex of his career.

[alpacinou]

I want to say a goal is a football player's greatest and most important goal. Are these good?

1. He has scored countless important goals, but this goal against Italy is the apex of his career.
2. He has scored countless important goals, but this goal against Italy is his magnum opus.

 

[Tarheel]

The first one is OK. The second one does not, I think, work for sports.

 

[SoothingDave]

No, "magnum opus" doesn't work for sports. I would call it a "career highlight" or "highlight of his career."