The Americans donated time and equipment to the non-profit aiming to introduce underprivileged children to tennis.

The 22-year-old Norwegian is the first man to win three ATP titles in as many weeks in nearly a decade.

The American won the friendly contest, 6-4, 6-4, over the fellow former US Open champion.

The 27-year-old represented Spain for the second time on the Olympic stage, reaching the women's singles quarterfinals.

The Japanese star has demonstrated a similar steadfastness to the 77-year-old, and thus has earned herself a special place in the legend's heart.

She joins Marc Rosset, Roger Federer and Stan Wawrinka in the elite club.

The Aussie provides a brief behind-the-scenes look at the special event.

He's 10-15 overall against the three greatest men’s players of all time, but even more dangerous in best-of-three format.

Meanwhile, Matteo Berrettini removed himself as a possible candidate for the role.

The world No. 1 fell to Germany's Alexander Zverev in three sets in Tokyo.