Are You Mentally Tough?
People who are mentally tough have a psychological edge that enables them to cope better than others with the demands that competition places on a performer, athlete, business person, or anyone in competition. They are also more consistent and better than their competition in remaining determined, focused, confident, and in control under pressure.
Check out this excellent article on the 12 key attributes of mental toughness. Although the article pertains to athletes, it suitable to any pursuit where you want to win.