Mackenzie McDonald and Jenson Brooksby entered an exclusive tennis club on Thursday when the latter defeated No. 2 seed Casper Ruud in the second round of the Australian Open.

Brooksby defeated Ruud in four sets 6-3, 7-5, 6-7(4), 6-2 to earn a spot in the all-American third round.

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Jenson Brooksby celebrates after defeating Casper Ruud at the Australian Open in Melbourne on Thursday, January 19, 2023.
(AP Photo/Dita Alangkara)

«I was getting a little bit more frustrated that I didn’t close it out, and my mindset was changing a little bit,» Brooksby said after the game. «Those are the situations that you have to deal with sometimes in matches and that you’re going to face. I think the biggest question is: How do you respond? I told myself I had to restart.»

Brooksby’s victory over Ruud came after McDonald knocked out No. 1 seed Rafael Nadal on Wednesday.

According to ESPN Stats & Info, McDonald and Brooksby became the sixth pair of American tennis players to defeat the 1st and 2nd seeds at the same Grand Slam tournament in the Open Era. The last instance occurred at the 1994 French Open, when Jim Courier and Aaron Krickstein defeated Pete Sampras and Michael Stich, respectively.

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It is the first time the top two seeds have been knocked out at the end of the second round since the 2002 Australian Open.

Eight American men are in the third round of the Australian Open. It’s the most in the third round of the tournament since the same number did so in 1996.

Frances Tiafoe celebrates after defeating Shang Juncheng in their second round match at the Australian Open in Melbourne, Wednesday, January 18, 2023.

Frances Tiafoe celebrates after defeating Shang Juncheng in their second round match at the Australian Open in Melbourne, Wednesday, January 18, 2023.
(AP Photo/Aaron Favila)

Michael Mmoh, Ben Shelton, Tommy Paul, JJ Wolf, Frances Tiafoe and Sebastian Korda advance to the third round. Mmoh defeated number 12 Alexander Zverev 6-7 (1), 6-4, 6-3, 6-2.

«Life is crazy. Just when you think everything looks dim, everything looks dark, there’s a light at the end of the tunnel,» Mmoh said. «My week is proof of that.»

Michael Mmoh plays a backhand return to Alexander Zverev at the Australian Open in Melbourne on Thursday, January 19, 2023.

Michael Mmoh plays a backhand return to Alexander Zverev at the Australian Open in Melbourne on Thursday, January 19, 2023.
(AP Photo/Ng Han Guan)

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At least two will be eliminated for sure before the fourth round. Brooksby will take on Paul and Mmoh will take on Wolf.

Associated Press contributed to this report.