# Learner Tien

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

## Early life

Tien was born in Irvine, California to Vietnamese Chinese Khuong Dan Tien and Huyen Tien. His first name, Learner, is inspired by his mother's profession — a math teacher. His sister is named Justice after his father's profession — a real estate lawyer.
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.

## Junior career

Tien had a successful career as a junior, compiling a 76–23 win-loss record and reaching two junior Grand Slam finals, at the 2023 Australian Open and the 2023 US Open, culminating with a combined ITF ranking of world No. 4. In doubles compiling a 36–18 win-loss record and winning the 2023 Australian Open, partnering Cooper Williams.

### Junior Grand Slam singles results

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

### Junior Grand Slam doubles results

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

## Professional career
### 2022–2023: Junior National champion, Grand Slam debut

At just 16 years old, Tien won the 2022 USTA Boys 18s National Championship, which earned him a wildcard into the main draw of the 2022 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-old Donald Young (also the champion at Kalamazoo) played in the 2005 US Open, and also the first player aged 16 to compete since Zachary Svajda in 2019. He lost in four sets to 32nd seed Miomir Kecmanović.
In August 2023, he received a wildcard into the 2023 US Open but lost to Frances Tiafoe in the first round.

### 2024: First Challenger titles & ATP quarterfinal, top 125

In July, Tien also received a wildcard for the 2024 Cranbrook Tennis Classic in Bloomfield Hills, Michigan where he lifted his maiden Challenger title. He became the youngest American Challenger champion since 2016, when an 18-year-old Frances Tiafoe won in Granby, Canada. He also won the M25 in Lakewood, California, increasing his winning streak to 25. At the end of July, a week later, he again made the quarterfinals at the 2024 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 seed Hong Seong-chan. He lost to Yunchaokete Bu, ending a 28-match winning streak across ITF and ATP Challenger tournaments. A week later, he also made the quarterfinals at the 2024 Lexington Challenger but lost to Hugo Grenier.
He secured a main draw wildcard for the US Open by winning the US Open wildcard challenge. Ranked No. 231, Tien qualified for the main draw at the 2024 Winston-Salem Open. There he defeated fellow qualifier Tristan Schoolkate and upset ninth seed Fábián Marozsán and Thiago 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 since Brandon 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.
He won his second Challenger title in Las Vegas, defeating Tristan Boyer, and moved up another 40 positions in the singles rankings to a new career-high of No. 151 on 16 September 2024. He reached the top 125 in the rankings at world No. 124 on 14 October 2024, following another title at the Fairfield Challenger after playing a 39-minute final, the shortest championship match in Challenger history, against Bernard Tomic. He became the fourth American to win three ATP Challenger Tour titles before his 19th birthday after Taylor Fritz, Andy Roddick and Sam Querrey. As a result on 26 November 2024, at 18 years old, Tien qualified for the 2024 Next Generation ATP Finals.

### 2025: Australian Open debut & fourth round, two top 5 wins, top 75

Ranked No. 121, Tien made his Australian Open debut after qualifying into the main draw. He defeated Camilo Ugo Carabelli in the first round for his maiden Grand Slam win. Next, he upset fifth seed Daniil 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, since Pete Sampras in 1990. Tien defeated Corentin 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 the Open Era (after Sampras), and the youngest player since Rafael Nadal in 2005. His run ended with a loss to Lorenzo Sonego, in four sets.
At the 2025 Abierto Mexicano Telcel he qualified for the main draw and defeated top seed and world No. 2 Alexander 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, when Andy Roddick, who was 18 years old at the time, defeated a No. 1-ranked Gustavo 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.

## Performance timelines

Key :
| W | F | SF | QF | #R | RR | Q# | P# | DNQ | A | Z# | PO | G | S | B | NMS | NTI | P | NH |

### Singles

Current through the 2025 BNP Paribas Open.
| Tournament | 2022 | 2023 | 2024 | 2025 | SR | W–L | Win% |
| Grand Slam tournaments ||||||||
| Australian Open | A | A | A | 4R | 0 / 1 | 3–1 | 75% |
| French Open | A | A | A | | 0 / 0 | 0–0 | – |
| Wimbledon | A | A | A | | 0 / 0 | 0–0 | – |
| US Open | 1R | 1R | 1R | | 0 / 3 | 0–3 | 0% |
| Win–loss | 0–1 | 0–1 | 0–1 | 3–1 | 0 / 4 | 3–4 | 43% |
| ATP Masters 1000 ||||||||
| Indian Wells Open | A | Q1 | A | 1R | 0 / 1 | 0–1 | 0% |
| Miami Open | A | Q1 | A | | 0 / 0 | 0–0 | – |
| Monte-Carlo Masters | A | A | A | | 0 / 0 | 0–0 | – |
| Madrid Open | A | A | A | | 0 / 0 | 0–0 | – |
| Italian Open | A | A | A | | 0 / 0 | 0–0 | – |
| Canadian Open | A | A | A | | 0 / 0 | 0–0 | – |
| Cincinnati Open | A | A | A | | 0 / 0 | 0–0 | – |
| Shanghai Masters | A | A | A | | 0 / 0 | 0–0 | – |
| Paris Masters | A | A | A | | 0 / 0 | 0–0 | – |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–1 | 0 / 1 | 0–1 | 0% |
| Career statistics ||||||||
| | 2022 | 2023 | 2024 | 2025 | Career | Career | Career |
| Tournaments | 1 | 1 | 2 | 5 | 9 | 9 | 9 |
| Overall win–loss | 0–1 | 0–1 | 5–4 | 6–5 | 11–11 | 11–11 | 11–11 |
| Year-end ranking | 860 | 452 | 122 | | 50% | 50% | 50% |

## ATP Next Generation finals
### Singles: 1 (1 runner-up)

| 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 |

## ATP Challenger and ITF World Tennis Tour finals
### Singles: 12 (10 titles, 2 runner-ups)

* Legend
* ATP Challenger Tour (3–1)
* ITF WTT (7–1)
* Finals by surface
* Hard (10–2)
* Clay (0–0)
* Grass (0–0)
* Carpet (0–0)
| 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 |

### Doubles: 4 (4 titles)

* Legend
* ATP Challenger Tour (0–0)
* ITF WTT (4–0)
* Finals by surface
* Hard (4–0)
* Clay (0–0)
* Grass (0–0)
* Carpet (0–0)
| 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] |

## Junior Grand Slam finals
### Singles: 2 (2 runner-ups)

| 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 |

### Doubles: 1 (1 title)

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

## Wins over top-10 players

* Tien has a 2–0 record against players who were, at the time the match was played, ranked in the top 10.
| Season | 2025 | Total |
| Wins | 2 | 2 |
| # | Player | Rk | Event | Surface | Rd | Score | Rk |
| 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 |
| 2. | Alexander Zverev | 2 | Mexican Open, Mexico | Hard | 2R | 6–3, 6–4 | 83 |
* 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