Key statistics for predicting winners on grass courts primarily include players' serve performance, such as aces, first serve percentage, and service games won, as grass surfaces favor powerful serving. Additionally, return statistics like break points saved and return games won are crucial, as the ability to capitalize on opponents' weaknesses can be decisive on this surface. Players' past performance on grass, including match wins, head-to-head records, and overall ranking, also offer valuable insights. Grass court play tends to favor aggressive players with a strong net game, so statistics on volley success rates and overall agility can further inform predictions. Ultimately, combining these factors with players' current form and fitness levels provides a more complete analysis for forecasting outcomes in grass court matches.