Ego

[Freddy]

Originally Posted by bas2456

On the court, you must, however, exude confidence as others have said.

Agree with previous posters.
Substitute "confidence", a relatively positive concept, for "ego", with all the negative baggage that sometimes goes along with it.
Then, add the fact that "There's sometimes a fine line between confidence and cockiness," and your mindset is on solid ground, methinks.
That's a fine line we're all called to walk. And like Johnny Cash sang, "I walk the line."