Jannik Sinner, at the age of 23, is not only one of the most successful Italian tennis players in history, but he is also a wealth multiplier, as have been other notable champions in other disciplines. Anef, the national cable car operator, estimated in the beginning of the 1990s that Alberto Tomba's triumphs in the Ski World Cup, during his three years of peak performance, contributed to a 20% increase in the sale of ski passes in Italy. In the second half of 1998, following Marco Pantani's triumph in the Tour de France, the National Association of Cycles and Motorcycles reported a 15% rise in racing bike sales over the same period the previous year. Then it was the turn of Valentino Rossi who promoted the selling of supersport motorcycles. Now it's Jannik's turn, the world number one, winner of two Grand Slam titles in 2024 - Australia and the United States - as well as the ATP Finals and Davis Cup with the national team. As of December 31, 2023, the Italian Tennis Federation had 820,000 members; it now has 1,027,000. Individual classes in Italian clubs have increased by 30%, particularly among young people aged 6 to 18. In 2024 alone, the Sinner effect had a direct impact of 21 million euros, accounting exclusively for court reservations and equipment sales.