The aim of the study was to analyze the participation and the influence of the líbero player in the assault phase and in the defense phase in male high-level volleyball. The sample of study was composed by 1101 actions of game of receipt and defense, of four equipments better classified under the Olympic Games of Pekin 2008. The variables of study were: player reception/defense, zone of reception/defense, efficiency of the receipt/defense, and efficiency of the placement, zone of assault/counterattack, time of assault/counterattack and efficiency of the assault/counterattack. Data were treated in an initial phase through descriptive statistical techniques and, subsequently, was used inferential statistical techniques, based on the latter, in contingency tables, Chi-square and Cramer's V values. The results showed that in the phase of assault significant associations did not exist between the different studied variables and the player who receives (Mesquita et al. 2007). On the contrary, in the phase of defense there were significant associations between: the player who defends and the zone of defense, predominating over the defense of the líbero in defensive zone (left side); the player who defends and the efficiency of the defense, being major that waited by the random the defense of efficiency 4 on the part of the player líbero, opposite to the predominance of the efficiency 0 when another player defends; the player who defends and the zone of counterattack and the assaults being increased by zone 6 when it defends the líbero. The participation of libero player on defense is significantly higher than the rest of their peers in defensive zone (left side), fundamental importance in defense field. Quality of his performance defensive (libero), as well as frequent intervention zone (5 zone), allowing both aspects the use of fast attack combinations that generate more uncertainty and defensive difficulty for the opponent.
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