This study introduces a novel pressure index framework designed to quantify the intensity of crucial moments in an American football game. Our model integrates game-specific metrics such as time remaining, score differential, field position, and play context to establish quantitative measures of pressure on offensive and defensive units. The two proposed indices, viz, the composite offensive pressure index (PIO3) and defensive pressure index (PID) dynamically capture the evolving situational stress during a game. To validate and assess their predictive power, we employ machine learning techniques, including Logistic Regression, Random Forest, and Gradient Boosting models. Using play-by-play data from the 2023 NFL season, the results demonstrate that the ensemble learning methods outperform logistic regression, with Gradient Boosting achieving the highest predictive precision (AUC = 0.944) in forecasting drive success. This machine learning-driven framework provides new insights into situational dynamics and performance under pressure such as identifying pivotal clutch moments and quantifying critical drive transitions offering potential applications in advanced performance analysis, coaching strategies, and sports analytics research.
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