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This article addresses the issues of players’ heterogeneity in individual efforts and winning probability in the Association of Tennis Professionals (ATP) games. ATP players’ personal characteristics and performance from 2011 to 2013 are collected. The results show that a negative impact of the matchup’s heterogeneity on the intensity of the game is found. The evidence thus indicates that the two players play harder when the heterogeneity is smaller. Evidence also indicate that the pecuniary incentive in tournaments is supported, and appearance of a superstar makes his opponent exert less effort. In the odds ratio analysis for the players’ heterogeneity, a rank differential increases a favorite player with 1.004% winning percentage in ATP matches. Younger, lower BMI, experienced, and right-hand players are more likely to win. Key words: Competition, Heterogeneous contestants, Random-effects logistic model, Superstar effects, Tournament theory JEL: D01, M52, L83. Posebnost podsticanja na turnirima i efekti heterogenosti napora igraca u Udruženju teniskih profesionalaca Rad govori o problemima heterogenosti igraca u pojedinacnim naporima i verovatnoci pobede u igrama Udruženja teniskih profesionalaca (ATP). Prikupljaju se licne karakteristike i performanse ATP igraca od 2011. do 2013. godine. Rezultati pokazuju negativan uticaj heterogenosti meca na intenzitet igre. Dokazi pokazuju da dvojica igraca igraju jace kada je heterogenost manja. Dokazi takođe ukazuju na znacaj novcanog podsticaja na turnirima, kao i da pojava sampiona cini da njegov protivnik ulaže manje napora. U analizi odnosa kvota heterogenosti igraca, razlika u rangu povecava omiljenog igraca sa 1.004% dobitaka u ATP utakmicama. Mlađi, niži BMI, iskusni i igraci koji igraju sa desnom rukom imaju vecu verovatnocu da pobede. Kljucne reci: Takmicenje, heterogeni takmicari, logisticki model nasumicnih efekata, efekat sampiona, teorija turnira.

Pecuniary incentive in tournaments and effects of players’ heterogeneity on efforts in the association of tennis professionals