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Altogether, using this formula, a pressure index ranging from 1 to 100 is created. It aims to rate the aggression of each shot based on precision, angle, and speed. The perfect shot would be fast, placed exactly in the corner, and hit with the maximum possible angle. As we see here, Zwerev hits the serve-plus-one shot mostly from the baseline. Now, let’s compare his shots in the first and fifth sets using the pressure index.