MELBOURNE, Australia — In a remarkable upset at the Australian Open, Alex Michelsen achieved one of the most significant victories of his early career by defeating 2023 finalist Stefanos Tsitsipas in the first round. The 20-year-old American showcased his resilience, managing to shake off pre-match nerves as he secured a 7-5, 6-3, 2-6, 6-4 victory over the 26-year-old Greek tennis star, who holds a career-high ranking of No. 3 and has made two Grand Slam final appearances.

Michelsen’s journey in tennis began at the tender age of three, training extensively with his mother, Sondra, a school teacher and former college tennis player. During his victory speech at John Cain Arena, one of Melbourne Park’s three primary show courts, Michelsen credited his mother for her unwavering support throughout his development. “I’m sure she’s watching right now,” he told the audience. “We would go out there and hit a million balls from the baseline every day. She would never miss a ball — she’s incredible. No chance I’d be here without her, so thanks Mom. Love you.”

Ranked No. 42, Michelsen previously reached the third round of the Australian Open last year during his debut, although he faced early exits at Roland Garros and Wimbledon, as well as a second-round loss at the U.S. Open. His victory over Tsitsipas marks his first over a top-20 player in a Grand Slam setting.

In his match against Tsitsipas, Michelsen displayed a bold playing style, particularly with his aggressive service returns, which proved essential during a pivotal ninth game in the fourth set that led to a crucial break. Despite experiencing some tension on his serve, where he lost two hard-fought breaks, he maintained his composure in the final game. “I didn’t take the most direct path, that’s for sure. Shouldn’t have gotten broken twice in the fourth. My serve let me down. I was double faulting way too much,” Michelsen acknowledged. “But I also returned really well. I felt like I was winning most of the baseline rallies when I was in position.”

At 4-all in the final set, after facing the disappointment of two breaks, Michelsen reminded himself to stay focused and treat each point independently. He responded by crafting a solid game when it mattered most and ultimately secured victory at 5-4. The match concluded with Michelsen recording eight aces along with eight double faults but standing out with an impressive 46 winners compared to 40 unforced errors.

“Above all, I was just trying to maintain my composure. I knew it would be a battle to the end,” he remarked. “It’s all about the mindset.”