Tighter for control, looser for power: the two rules of string tension are older than most of the research on them. What laboratory and on-court studies say about speed, launch angle, tension loss, feel and the elbow, and how to test tension properly.
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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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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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