We examined the influence of individual differences in anger regulation as potential moderators of the anger–performance relationship. Extending Lazarus, 1991 R.S. Lazarus, Cognition and motivation in emotion. American Psychologist, 46 (1991), pp. 352–367. [Lazarus, 1991] and [Lazarus, 2000a] cognitive–motivational–relational theory of emotion, we investigated the influence of trait anger and the anger regulation styles of anger-in and anger-out on the performance of a physical task. As hypothesized, trait anger and anger-out were positively associated with anger-derived performance enhancement on a peak force task; anger-in significantly inhibited the trait anger–performance relationship. Results are discussed in relation to Lazarus’s cognitive–motivational–relational theory and future research directions are offered.