Most of what decides a professional match happens away from the ball or in a few short exchanges. What match analysis and research on expertise suggest about where to look, what to count and how to keep a simple chart from the sofa.
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The professional tours now stop play by a heat stress index, not by the thermometer. What the 2026 heat rules say, what heat does to players, and what research supports for hydration, cooling at changeovers, acclimatisation and recognising heat stroke.
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Some of the best players in the world now slice more backhands than they did a few years ago. What the data say about how often the slice is used, where it wins and loses points, and what backspin really does to the ball.
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Type 1, Type 2, Type 3, high altitude, green, orange and red: the Rules of Tennis define more balls than most players realise. What separates them, how pressurised and pressureless balls differ, how a ball changes in play, and why ball choice is a coaching decision.
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