This book explores the relationship between mental toughness and Competitive anxiety in athletes. Competition anxiety, often marked by worry, apprehension, and physical tension, is a major psychological barrier that can impair performance and enjoyment in sports. Mental toughness, described through the 4Cs model-challenge, commitment, control, and confidence-has been recognized as a key psychological resource that helps athletes stay composed and perform under pressure.Through a cross-sectional analysis using validated sport psychology measures, this study provides evidence that greater mental toughness is associated with lower levels of competition anxiety. The findings contribute to the growing body of literature in sport psychology while also offering practical implications for athletes, coaches, and sport psychologists seeking to strengthen psychological skills and improve performance in competitive environments.