This study examined the main and stress-buffering effects of perceived and received support upon objective performance outcome. The sample consisted of 123 male British high performance golfers, mean age 25.3 years (SD = 5.4). Participants completed measures of perceived support, stressors, stress, and received support before competitions. After the competitions, performance outcome (number of shots) was recorded. When both types of support were considered separately, there were significant main effects for perceived (ΔR 2 = .08, b = -.81, p < .01) and received support (ΔR 2 = .05, b = -.68, p < .01) on performance. There were also significant stress-buffering effects for perceived (ΔR 2 = .03, b = -.48, p = .02) and received support (ΔR 2 = .06, b = -.61, p < .01). When both types of support were considered simultaneously, the significant main effect (R 2 = .09, p < .01) was primarily attributable to perceived support (b = -.63, p = .02). The significant stress-buffering effect (R 2 = .06, p = .01) was primarily attributable to received support (b = -.56, p = .04). These results demonstrate the beneficial influence of social support on performance. The findings highlight the need to recognise the distinction between perceived and received support, both in terms of theory and the design of social support interventions with athletes.The Effects of 3The Effects of Perceived and Received Support on Objective Performance Outcome Social support is a key construct in relation to mental health (see Kessler & McLeod, 1985, for a review), physical health (see Schwarzer & Leppin, 1991, for a review), and physiological processes (see Uchino, Cacioppo, & Kiecolt-Glaser, 1996, for a review). In sport, athletes have been encouraged to use social support as a useful resource (Richman, Hardy, Rosenfeld, & Callanan, 1989). Research has suggested that social support is beneficial in dealing with competitive stress (Crocker, 1992), slumps in performance (Madden, Kirkby, & McDonald, 1989), burn-out (Gould, Tuffey, Udry, & Loehr, 1996, and injury (Bianco, 2001;Smith, Smoll, & Ptacek, 1990). Recent studies have also demonstrated that social support is positively associated with performance outcome (Rees, Hardy, & Freeman, 2007) and process-related performance variables (Rees & Hardy, 2004;Rees, Ingledew, & Hardy, 1999). Additionally, a small number of qualitative studies have highlighted social support as a positive factor affecting sports performance (e.g., Gould, Guinan, Greenleaf, Medbery, & Peterson, 1999;Greenleaf, Gould, & Dieffenbach, 2001). The purpose of the present study was to further examine the influence of social support on objective performance outcome.Social support is a complex concept (Bianco & Eklund, 2001), encompassing structural and functional aspects of interpersonal relationships (Cohen & Wills, 1985). Functional aspects refer to the particular functions served by interpersonal relationships (Cohen, 1988 Eklund (2001) to incorporate measures of both perceived and received support in the same study.Th...