Four years ago in South Africa, the longtime rivals played a friendly exhibition match to raise more than $3 million for childhood education—and set a new world record in the process.

Four years ago in South Africa, longtime rivals Roger Federer and Rafael Nadal played a friendly exhibition match to raise more than $3 million for early childhood education—and ended up setting a new world record in the process.

The Match for Africa was a series of exhibition matches organized by Federer to raise money for his eponymous foundation, which works to fund schooling, transport and food for six southern African countries, including South Africa—the birth country of Federer’s mother.

While the first edition of the match launched in Zurich with a hilariously viral promo video—remember when Federer couldn’t stop laughing as Nadal struggled with his lines in English?—but when the Swiss finally took the match to Africa, it became a major event.

“It was an absolute pleasure to share the court with Rafa again, but the first time here in beautiful Cape Town in South Africa,” Federer said afterward. “It means so much more, and it really is very, very special on so many levels.”

“We tried our best as always,” Nadal said. “It’s a lifetime experience playing in front of such an amazing crowd in an amazing stadium. It was a big pleasure for me to be part of it.”