This It started with a camera angle. The Six Kings Slam, the richest tennis exhibition event in history, will award its winner $6million (£4.6m). Hosted in Riyadh and organized by Saudi Arabia’s General Entertainment Authority (GEA), it attracted six players with 53 Grand Slam titles between them — Rafael Nadal, Novak Djokovic, Carlos Alcaraz, Jannik Sinner, Daniil Medvedev and Holger Rune. Holograms of the contenders, all of whom received more than $1m just for turning up, beamed across the ven