It was history in the making.

Tennis greats Serena Williams and Roger Federer met up for the first time for a historic mixed doubles match at the Hopman Cup in Australia Jan. 1.

Federer and his partner Belinda Bencic knocked off Williams and her partner Francis Tiafoe in straight sets (4-2, 4-3, 5-3) to give Switzerland a 2-1 win over the U.S.

After the match, the two champions had nothing but praise for one another.

Williams said, “The guy is great, he’s the greatest of all time, to be honest.”

Federer said of the 23-time Grand Slam singles champ, “It was great fun and she is a great champion. You can see how focused she is and that’s what I love about her.”

The two even took selfies and were like old friends.

But in the end, the loss left the U.S. unable to reach the final of the event it’s captured six times.