Learner Tien

Tien at the2024 US Open
Country (sports)	United States
Residence	Irvine, California, US
Born	(2005-12-02)December 2, 2005 (age 19) Irvine, California, US
Height	1.80 m (5 ft 11 in)
Turned pro	2023
Plays	Left-handed (two-handed backhand)[1]
College	University of Southern California[2]
Coach	Eric Diaz
Prize money	US $1,097,522
Singles
Career record	11–12 (atATP Tour level,Grand Slam level, and inDavis Cup)
Career titles	0
Highest ranking	No. 66 (17 March 2025)
Current ranking	No. 66 (17 March 2025)[1]
Grand Slam singles results
Australian Open	4R (2025)
US Open	1R (2022,2023,2024)
Doubles
Career record	1–2 (at ATP Tour level, Grand Slam level, and in Davis Cup)
Career titles	0
Highest ranking	No. 722 (February 3, 2025)
Current ranking	No. 736 (March 3, 2025)[1]
Grand Slam mixed doubles results
US Open	1R (2024)
Last updated on: March 7, 2025.

Learner Tien (born December 2, 2005) is an American professionaltennis player. He has a career-highATP singles ranking of world No. 68, achieved on March 3, 2025 and a doubles ranking of No. 722, achieved on February 3, 2025.

Tien was born inIrvine, California to Vietnamese Chinese Khuong Dan Tien and Huyen Tien.^[3] His first name, Learner, is inspired by his mother's profession — a math teacher.^[4] His sister is named Justice after his father's profession — areal estate lawyer.^[5]

Tien started playing tennis when he was just a toddler, and won his first tournament at the Racquet Club of Irvine at the age of 5.^[5]

Tien had a successful career as a junior, compiling a 76–23 win-loss record and reaching two junior Grand Slam finals, at the2023 Australian Open^[6] and the2023 US Open, culminating with a combined ITF ranking of world No. 4. In doubles compiling a 36–18 win-loss record and winning the2023 Australian Open, partneringCooper Williams.^[6]

Australian Open: F (2023)
French Open: SF (2023)
Wimbledon: QF (2022,2023)
US Open: F (2023)

Australian Open:W (2023)
French Open: QF (2023)
Wimbledon: 2R (2022)
US Open: 2R (2022)

At just 16 years old, Tien won the2022 USTA Boys 18s National Championship, which earned him a wildcard into the main draw of the2022 US Open. This made him the youngest player to compete in the men’s singles main draw at the US Open since a then-16-year-oldDonald Young (also the champion at Kalamazoo) played in the2005 US Open, and also the first player aged 16 to compete sinceZachary Svajda in 2019.^[7] He lost in four sets to 32nd seedMiomir Kecmanović.

In August 2023, he received a wildcard into the2023 US Open but lost toFrances Tiafoe in the first round.^[8]

In July, Tien also received a wildcard for the2024 Cranbrook Tennis Classic in Bloomfield Hills, Michigan where he lifted his maiden Challenger title.^[9] He became the youngest American Challenger champion since 2016, when an 18-year-oldFrances Tiafoe won in Granby, Canada.^[10][11] He also won the M25 in Lakewood, California, increasing his winning streak to 25.^[12][13]At the end of July, a week later, he again made the quarterfinals at the2024 Chicago Men's Challenger and reached the top 250 in the rankings on 29 July 2024. He reached his second Challenger semifinal of the season, defeating eight seedHong Seong-chan.^[14] He lost toYunchaokete Bu, ending a 28-match winning streak across ITF and ATP Challenger tournaments. A week later, he also made the quarterfinals at the2024 Lexington Challenger but lost toHugo Grenier.^[15]

He secured a main draw wildcard for theUS Open by winning the US Open wildcard challenge.^[16][17][18]Ranked No. 231, Tien qualified for the main draw at the2024 Winston-Salem Open. There he defeated fellow qualifierTristan Schoolkate and upset ninth seedFábián Marozsán^[19] andThiago Seyboth Wild to record his first three ATP Tour wins and reach his first ATP quarterfinal. He became the youngest American ATP tour-level quarterfinalist sinceBrandon Nakashima in 2020 (in Delray Beach). As a result he climbed 40 positions in the singles rankings to world No. 191 on 26 August 2024.^[20]

He won his second Challenger title inLas Vegas, defeatingTristan Boyer,^[21] and moved up another 40 positions in the singles rankings to a new career-high of No. 151 on 16 September 2024.^[22] He reached the top 125 in the rankings at world No. 124 on 14 October 2024,^[23] following another title at theFairfield Challenger after playing a 39-minute final, the shortest championship match in Challenger history, againstBernard Tomic. He became the fourth American to win three ATP Challenger Tour titles before his 19th birthday afterTaylor Fritz,Andy Roddick andSam Querrey.^[24][25]As a result on 26 November 2024, at 18 years old, Tien qualified for the2024 Next Generation ATP Finals.^[26][27]

Ranked No. 121, Tien made hisAustralian Open debut after qualifying into the main draw.^[28] He defeatedCamilo Ugo Carabelli in the first round for his maiden Grand Slam win.^[29] Next, he upset fifth seedDaniil Medvedev, for his first top 10 and top 5 win, after winning the 10-point tiebreaker in the fifth set, in a 4 hours and 50 minutes match that ended at 3 am in Melbourne. At 19 years old he became the youngest American player to reach the third round of the tournament in 35 years, sincePete Sampras in 1990.^[30][31][32] Tien defeatedCorentin Moutet in straight sets to reach the fourth round of a Grand Slam for the first time in his career and moved into the top 100 in the singles rankings. With the win, he became the second-youngest American man to reach the fourth round at the Australian Open in theOpen Era (after Sampras), and the youngest player sinceRafael Nadal in 2005.^[33] His run ended with a loss toLorenzo Sonego, in four sets.

At the2025 Abierto Mexicano Telcel he qualified for the main draw and defeated top seed and world No. 2Alexander Zverev, recording his biggest win by ranking, to reach his first ATP 500-level quarterfinal. He became the youngest American man to beat a Top 3 player since 2001, whenAndy Roddick, who was 18 years old at the time, defeated a No. 1-rankedGustavo Kuerten in the third round of the Canadian Masters. He was also the youngest man since 2022 to defeat a No. 3-ranked Zverev in the Madrid final, when Carlos Alcaraz, a younger 19 at the time, did it. As a result he moved into the top 70 in the singles rankings on 3 March 2025.^[34][35][36]

Current through the2025 Miami Open.

Result	Date	Tournament	Surface	Opponent	Score
Loss	Dec 2024	Next Generation ATP Finals, Saudi Arabia	Hard (i)	João Fonseca	4–2, 3–4(8–10), 0–4, 2–4

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Win	1–0	Jul 2024	Cranbrook Tennis Classic, US	Challenger	Hard	Nishesh Basavareddy	4–6, 6–3, 6–4
Win	2–0	Sep 2024	Las Vegas Challenger, US	Challenger	Hard	Tristan Boyer	7–5, 1–6, 6–3
Win	3–0	Oct 2024	Fairfield Challenger, US	Challenger	Hard	Bernard Tomic	6–0, 6–1
Loss	3–1	Nov 2024	Knoxville Challenger, US	Challenger	Hard (i)	Christopher Eubanks	5–7, 6–7(9–11)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Oct 2022	M15 Fayetteville, US	WTT	Hard	Toby Samuel	3–6, 3–6
Win	1–1	Jun 2023	M15 Irvine, US	WTT	Hard	Quinn Vandecasteele	7–5, 6–2
Win	2–1	Oct 2023	M15 Norman, US	WTT	Hard (i)	Duarte Vale	7–6(8–6), 6–2
Win	3–1	Nov 2023	M25 Columbus, US	WTT	Hard (i)	Jacob Fearnley	2–0 ret.
Win	4–1	May 2024	M15 San Diego, US	WTT	Hard	Karue Sell	6–7(6–8), 6–2, 6–2
Win	5–1	Jun 2024	M15 San Diego, US	WTT	Hard	Alafia Ayeni	6–4, 6–7(5–7), 6–4
Win	6–1	Jun 2024	M15 Rancho Santa Fe, US	WTT	Hard	Matthew Summers	6–3, 6–1
Win	7–1	Jul 2024	M15 Lakewood, US	WTT	Hard	Govind Nanda	6–3, 6–3

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Nov 2022	M15 East Lansing, US	WTT	Hard (i)	Alex Michelsen	Joshua Goodger Emile Hudd	6–4, 6–3
Win	2–0	Jun 2023	M15 Irvine, US	WTT	Hard	Bryce Nakashima	Joshua Goodger Matthew Summers	6–4, 6–2
Win	3–0	Nov 2023	M25 Austin, US	WTT	Hard	Edward Winter	Sebastian Gorzny Brayden Michna	4–6, 6–3, [10–2]
Win	4–0	May 2024	M15 San Diego, US	WTT	Hard	Sebastian Gorzny	Robin Catry Braden Shick	1–6, 6–3, [10–1]

Result	Year	Tournament	Surface	Opponent	Score
Loss	2023	Australian Open	Hard	Alexander Blockx	1–6, 6–2, 6–7(9–11)
Loss	2023	US Open	Hard	João Fonseca	6–4, 4–6, 3–6

Result	Year	Tournament	Surface	Partner	Opponents	Score
Win	2023	Australian Open	Hard	Cooper Williams	Alexander Blockx João Fonseca	6–4, 6–4

• Tien has a 2–0 record against players who were, at the time the match was played, ranked in the top 10.^[37]

#	Player	Rk	Event	Surface	Rd	Score	Rk	Ref
2025
1.	Daniil Medvedev	5	Australian Open, Australia	Hard	2R	6–3, 7–6(7–4), 6–7(8–10), 1–6, 7–6(10–7)	121	[38]
2.	Alexander Zverev	2	Mexican Open, Mexico	Hard	2R	6–3, 6–4	83	[39]

• Key: (Rk) first use, opponent rank; (Rd) round; (Rk) 2nd use, player rank; (Ref) reference; (F) final; (SF) semifinal; (QF) quarterfinal; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage

• Learner Tien at theAssociation of Tennis Professionals
• Learner Tien at theInternational Tennis Federation

• 2005 births
• Living people
• American male tennis players
• American sportspeople of Vietnamese descent
• Sportspeople of Vietnamese descent
• Australian Open (tennis) junior champions
• Grand Slam (tennis) champions in boys' doubles
• Sportspeople from Irvine, California
• Tennis players from California
• USC Trojans men's tennis players
• 21st-century American sportsmen

• CS1 French-language sources (fr)
• Articles with short description
• Short description is different from Wikidata
• Use mdy dates from January 2023
• ITF template using non-numeric ID