Mumbai, January 13: Alex Michelsen produced the biggest win so far of his fledgling career to upset 2023 runner-up Stefanos Tsitsipas in the first round of the Australian Open, and he knew instinctively where credit was due. The 20-year-old American overcame nerves on his serve in the fourth set before clinching a 7-5, 6-3, 2-6, 6-4 win Monday over Tsitsipas, a 26-year-old from Greece who has a career-high No. 3 ranking and has contested two Grand Slam finals. Michelsen started playing tennis around age 3 and hit most days as a kid with his mother, Sondra, a school teacher who played college tennis. Coco Gauff Starts Her Australian Open 2025 Campaign With Straight-Sets Win Over Sofia Kenin.

“Yeah, I'm sure she's watching right now. Yeah, we hit a million balls from the baseline every day. We'd go like 30 minutes up the middle, then we go across each way for like an hour and a half. I mean we would just go out there and she would never miss a ball — she's incredible. But no chance I'd be here without without her, so thanks Mom. Love you." Michelsen told the crowd on John Cain Arena, one of the three main show courts at Melbourne Park.

The No. 42-ranked Michelsen reached the third round last year on his Australia debut before losing in the first rounds at Roland Garros and Wimbledon and in the second round at the U.S. Open. His win over Tsitsipas was Michelsen's first against a player ranked in the top 20 at a Grand Slam. Sumit Nagal Knocked Out of Australian Open 2025, Loses First Round Match Against Tomas Machac in Straight Sets.

He played with freedom against Tsitsipas, taking big swipes with his service returns — including three in one game late in the fourth set that helped earn him a vital break. He got a bit tense on serve, surrendering two hard-earned breaks in the fourth set, but stayed composed in the last game. He finished the match with eight aces and eight double-faults, but hit 46 winners to only 40 unforced errors.

“First of all, I was just trying to stay super composed out there. I knew it was going to be a battle in the end,” he said. The serve “started to let me down a little bit in the fourth, but super happy. It's all about the mindset.”

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