The aim of this study was to evaluate the playing contribution degree of water polo field player and team who participated in 2017 world championships (16 teams, 176 players) by using of official match statistics and originally developed playing contribution coefficient. The results of all the ball possessions were analysed from the official play-by-play statistics. The contribution coefficient of each event results were used same as the previous study (Enomoto et al., 2001) as follows; goals (1.0), missed shots (-0.3), personal fouls (-0.38), loss of ball possession (turnovers, -0.1), and acquisition of ball possession (steals, 0.1), respectively. The total number of occurrences for each event and their contribution coefficient were incorporated to calculation the total of each multiplied event point of each player. This point was divided by total playing time, followed with Z-score transformation for all players to define Playing Contribution Index (PCI). The average PCI of driver (52.7 ± 6.3) was statistically higher than the average PCI of centre forward (46.4 ± 11.4) in this tournament. The average of PCI for each team had a moderate correlation with the ranking of each team of this championship (I = -0.49). With regards to the driver (n = 102), the average of PCI for each team had a significant correlation with the ranking of each team of this championship (I = -0.63). With regards to the centre forward (n = 74), the average of PCI for each team had a no significant correlation with the ranking of each team of this championship.
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