The following paragraphs come from an article on Coach Dave Rogers.
According to the Journal of Applied Sports Psychology, 2002, mental toughness is having the natural or developed psychological edge that enables you to:
Cope – generally cope better than your opponents with the many demands such as training, lifestyle and head to head competition that are [...]

Here are some of the opening paragraphs in an interesting article by Grant Dodd that appears on iseekgolf.com
John Crampton must have felt like Osama bin Laden in front of the United States congress. Addressing a group of reluctant, somewhat hostile, NSW State Amateur squad members on the semi-mystical, unexplored subject of sports psychology (a notion [...]

By Melinda Frey, PhD, CC-AASP, University of Utah
In the summer of 2007, we conducted a study to examine the race preparation strategies of age-group Olympic distance triathletes competing in select races in the State of Utah. Our objective was to understand the basic differences in preparation between the top and bottom 25% of race finishers. [...]