Daniil Medvedev was 7 years old and living with his family in Moscow when Roger Federer rose to No. 1 in the ATP rankings on Feb. 2, 2004.
There was no suspecting it then, but Federer’s achievement was the start of an extraordinary period of tennis domination by a small group of men who came to be known as the Big Four.
Together, Federer, Rafael Nadal, Novak Djokovic and, to a lesser degree, Andy Murray hoarded the Grand Slam singles titles and the regular tour’s most prestigious titles, taking turns at No. 1 for more than 18 years.