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Until 2006, badminton used a service-only system in which points could be scored only by the serving side — men played games to 15, women to 11 — which made matches unpredictable in length and hard to schedule for television. The BWF adopted rally-point scoring to 21 in 2006, awarding a point on every rally regardless of who served. The change made matches faster and more consistent in duration, rewarded relentless shot-to-shot consistency, and suited broadcasters. A game is now won by the first to 21 with a two-point margin, capped at 30, and a match is the best of three games. The reform is widely credited with modernising the sport's rhythm.

The shuttlecock is the fastest object in racquet sport off the racket. In a controlled Yonex test in 2013, Malaysia's Tan Boon Heong recorded a smash of 493 km/h (306 mph), and in-competition hits have been measured above 400 km/h. However, the shuttle decelerates more violently than any comparable projectile because its feathered skirt creates enormous drag. That is why a smash struck at 400 km/h can still be returned — by the time it crosses the net and reaches the defender it has shed most of its speed. This unique combination of blistering launch speed and rapid deceleration is exactly what makes badminton both explosive and, for defenders, improbably retrievable.

The most common answer is China's Lin Dan, and it is close to consensus. Nicknamed Super Dan, he won consecutive Olympic golds in 2008 and 2012 — the first man to defend the singles title — took five World Championships and six All England titles, and is the only player to have held all nine of the sport's major titles, the Super Grand Slam. His fiercest rival, Malaysia's Lee Chong Wei, spent a record 349 weeks as world No. 1 but never won Olympic or world gold, losing several finals to Lin. Across eras, figures such as Rudy Hartono, Susi Susanti and Carolina Marin also enter the debate, but Lin Dan survives every version of the argument.

Elite badminton is overwhelmingly concentrated in Asia — China, Indonesia, Malaysia, Japan and Korea — for reasons of culture and structure. In Indonesia the sport is a national passion with a deep grassroots club system, while China operates a centralised state academy that identifies and develops talent from childhood, producing extraordinary depth across all five disciplines. The intensity of domestic competition in these countries means players face world-class opponents constantly. Denmark is the lone traditional European power, and India, Thailand and Chinese Taipei have risen strongly in recent years. But the combination of mass participation, institutional investment and fierce internal competition keeps East and Southeast Asia as the sport's unshakeable heartland, producing the majority of Olympic and world champions.

The court is the same length, 13.4 metres, for both, but the width and service boxes differ. Singles uses the inner side lines, making the court 5.18 metres wide, and the full-length back boundary, creating a long, narrow court that rewards deep clears and corner-to-corner movement. Doubles uses the full outer side lines, 6.1 metres wide, but a shorter service court — the serve must land inside the doubles long service line, roughly 0.76 metres short of the back line — to prevent an overwhelming serving advantage in the faster doubles game. In practice this means the side tramlines are in for doubles but out for singles, and the deep service area is out for the doubles serve.

Lee Chong Wei was one of the greatest players in history and spent a record 349 weeks as world No. 1, yet the biggest titles eluded him largely because of Lin Dan. He reached three Olympic finals (2008, 2012, 2016) and four World Championship finals, losing all of them, three of those decisive defeats coming against Lin. The 2011 and 2013 world finals and the 2012 Olympic final, in particular, were agonisingly close contests decided by the finest of margins. He also overcame a 2015 doping ban and a 2018 nasal cancer diagnosis late in his career. His story is the sport's great near-miss: sustained dominance and 69 titles, but never the single gold his career deserved.