Sport provides a significant role in the lives of athletes; however, both positive and negative mental health effects may occur from sporting experiences, including burnout and/or well-being. A cross-sectional survey was conducted including 685 athletes (Mage = 23.39, SD = 6.22, 71% = male), testing multiple, complementary, self-determination theory hypotheses linked to well-being, and burnout. A multistage modeling approach encompassing confirmatory factor and path analysis was utilized, with results showing significant variance explained for well-being (R2 = .30) and burnout (R2 = .35). Several direct effects were found in line with self-determination theory, including between; needs-support and needs-satisfaction (ß = 0.48), and needs-control and needs-frustration (ß = 0.44); needs-satisfaction and motivational orientation (ß = 0.25); needs-satisfaction and well-being (ß = 0.37), and needs frustration and burnout (ß = 0.25); and motivational orientation and burnout (ß = -0.27), and motivational orientation and well-being (ß = 0.18). Indirect effects were found for well-being and burnout via coach needs-support, needs-satisfaction, and motivational orientation in sequence (ß = 0.24 and ß = -0.22, respectively), in addition to burnout via coach needs-control, needs frustration, and motivational orientation in sequence (ß = -0.12). To conclude, coach-based, sporting mental health interventions that promote the utilization of needs-supportive behaviors, while also highlighting the need to minimize needs-controlling behaviors, are recommended for the prevention of burnout and the promotion of well-being in athletes.
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