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If we compare the sets overall, we observe a higher pressure index in the won sets (2 and 3) and a lower one in the first, fourth, and fifth set, which Zwerev lost. Therefore, aggression in the serve-plus-one appears to be a valid and relevant parameter for winning points. To verify this, I examined the correlation between pressure index and success. Since this shot is likely more relevant in shorter rallies, only rallies with up to six strokes were included.