History of Learner Tien in Timeline

Learner Tien is an American professional tennis player. He reached a career-high ATP singles ranking of No. 36 on September 29, 2025, and a doubles ranking of No. 343 on August 18, 2025.

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Full Timeline Career & Achievements

1990: Youngest American at Australian Open

In 2024, at 19 years old Learner Tien became the youngest American player to reach the third round of the tournament in 35 years, since Pete Sampras in 1990.

2001: Youngest American Man to Beat Top 3 Player

In March 2025, Learner Tien became the youngest American man to beat a Top 3 player since 2001, when Andy Roddick defeated Gustavo Kuerten.

December 2, 2005: Birth of Learner Tien

On December 2, 2005, American professional tennis player Learner Tien was born.

Others born on this day/year

2005: Youngest at Australian Open since Nadal

In 2024, Learner Tien became the youngest player since Rafael Nadal in 2005 to reach the fourth round of the Australian Open.

2005: Donald Young at US Open

In the 2022 US Open, Learner Tien was the youngest player to compete in the men’s singles main draw at the US Open since a then-16-year-old Donald Young (also the champion at Kalamazoo) played in the 2005 US Open.

2016: Youngest American Challenger Champion

In July 2024, Learner Tien became the youngest American Challenger champion since 2016, when an 18-year-old Frances Tiafoe won in Granby, Canada.

2017: Youngest American to Reach Round of 16

In 2025, Learner Tien became the youngest American to reach the round of 16 at the Masters level since Frances Tiafoe in 2017.

2019: Zachary Svajda at US Open

In the 2022 US Open, Learner Tien was the youngest player to compete in the men’s singles main draw at the US Open and also the first player aged 16 to compete since Zachary Svajda in 2019.

2020: Youngest American ATP quarterfinalist

In August 2024, Learner Tien became the youngest American ATP tour-level quarterfinalist since Brandon Nakashima in 2020 (in Delray Beach).

2022: Grand Slam Results

In 2022, Learner Tien's results were: Wimbledon: 2R, US Open: 2R.

2022: USTA Boys 18s National Championship and US Open Main Draw Appearance

In 2022, at age 16, Learner Tien won the USTA Boys 18s National Championship, earning a wildcard into the main draw of the US Open. He became the youngest player to compete in the men’s singles main draw at the US Open since Donald Young in 2005 and the first 16-year-old since Zachary Svajda in 2019. He lost to Miomir Kecmanović.

2022: Youngest Man to defeat Zverev

In March 2025, Learner Tien was also the youngest man since 2022 to defeat Zverev in the Madrid final, when Carlos Alcaraz did it.

August 2023: US Open Appearance

In August 2023, Learner Tien received a wildcard into the US Open but lost to Frances Tiafoe in the first round.

2023: Junior Grand Slam Finals and ITF Ranking

In 2023, Learner Tien had a successful junior career, reaching two junior Grand Slam finals at the Australian Open and the US Open. He also achieved a combined ITF ranking of world No. 4. In doubles, he won the 2023 Australian Open, partnering with Cooper Williams.

2023: Australian Open Win

In 2023, Learner Tien won the Australian Open.

2023: Grand Slam Results

In 2023, Learner Tien's results were: Australian Open: F, French Open: SF, US Open: F

July 2024: Challenger Title and Ranking Increase

In July 2024, Learner Tien received a wildcard for the Cranbrook Tennis Classic in Bloomfield Hills, Michigan, winning his maiden Challenger title. He also won the M15 in Lakewood, California, increasing his winning streak to 25. At the end of July, he made the quarterfinals at the Chicago Men's Challenger and reached the top 250 in the rankings. He lost to Yunchaokete Bu, ending a 28-match winning streak across ITF and ATP Challenger tournaments.

August 2024: ATP Tour Wins and Ranking Increase

In August 2024, Learner Tien qualified for the main draw at the Winston-Salem Open. He defeated Tristan Schoolkate, Fábián Marozsán, and Thiago Seyboth Wild to record his first three ATP Tour wins and reach his first ATP quarterfinal. As a result, he climbed in the singles rankings to world No. 191 on August 26, 2024.

September 2024: Challenger Title and Ranking Improvement

In September 2024, Learner Tien won his second Challenger title in Las Vegas, defeating Tristan Boyer, and moved up in the singles rankings to a new career-high of No. 151 on September 16, 2024.

October 2024: Fairfield Challenger Title and Ranking Improvement

In October 2024, Learner Tien reached the top 125 in the rankings at world No. 124 on October 14, 2024, following another title at the Fairfield Challenger after playing a 39-minute final against Bernard Tomic, the shortest championship match in Challenger history.

November 2024: Next Generation ATP Finals Qualification

On November 26, 2024, at 18 years old, Learner Tien qualified for the 2024 Next Generation ATP Finals.

March 2025: ATP 500 Quarterfinal and Ranking Improvement

In March 2025, at the Abierto Mexicano Telcel, Learner Tien qualified for the main draw and defeated Alexander Zverev to reach his first ATP 500-level quarterfinal. He moved into the top 70 in the singles rankings on March 3, 2025.

August 2025: Doubles Ranking

In August 2025, Learner Tien achieved a doubles ranking of No. 343.

September 2025: Career-High ATP Singles Ranking

In September 2025, Learner Tien achieved a career-high ATP singles ranking of world No. 36.

2025: ATP Masters 1000 Fourth Round

In 2025, Learner Tien reached the fourth round of an ATP Masters 1000 for the first time in his career, at the National Bank Open, upsetting Denis Shapovalov.