Shintaro Mochizuki (Japanese: 望月 慎太郎, Mochizuki Shintarō, born 2 June 2003) is a Japanese professional tennis player.[1]
He has an ATP career-high singles ranking of world No. 92 on 10 November 2025 and a doubles ranking of No. 371 achieved on 18 October 2021. He is currently the No. 1 Japanese player.[2] Mochizuki became the first Japanese male player in history to win a Grand Slam boys’ singles title at 2019 Wimbledon.[3][4] Mochizuki achieved a career-high Junior ITF combined ranking of No. 1 on 15 July 2019.[5]
Shintaro Mochizuki was born on June 2, 2003, in Kawasaki, Kanagawa, Japan. His name "Shintaro" was given by his father, inspired by the novelist and politician Shintaro Ishihara.[6]
He started playing tennis at the age of 3. As a fifth grader, he represented Kawasaki Municipal Mukai Elementary School at the 32nd First Life National Elementary School Tennis Championship and managed to reach the semifinals.[7]
At the age of 12, he passed the selection test for the Masaaki Morita Tennis Fund and went to the United States to train at the IMG Academy in Florida.[3][8][6] He began attending N High School in 2019.[9]
In 2019 Mochizuki won the Wimbledon title after becoming the first Japanese male to reach a Grand Slam juniors singles final.[10][11][3] In September that year, he led the Japanese team to win the Junior Davis Cup in Orlando, Florida.[12]
In March, he qualified for his first ATP Masters 1000 main draw at the 2021 Miami Open having been given a wildcard for the qualifying competition.[13]
2023: Challenger title, Major debut, ATP semifinal, top 150
He reached the top 200 at world No. 198 on 12 June 2023.
In July, he made his Grand Slam debut after qualifying for the main draw of the 2023 Wimbledon Championships,[15] but lost in the first round to 16th seed Tommy Paul in straight sets. At the 2023 Hall of Fame Open he lost to Liam Broady also in the first round.
Ranked No. 215, he received a wildcard for the ATP 500 Japan Open. After nine attempts, he finally won his first match at the ATP Tour level, beating Tomás Martín Etcheverry in straight sets.[16][17] Next he defeated top seed Taylor Fritz for his first Top 10 win, to reach his first tour-level quarterfinal.[18] In the quarterfinals, he defeated Alexei Popyrin to reach his first-ever semifinal. He became the lowest-ranked Tokyo semifinalist since then-World No. 479 Kelly Jones in 1986.[19][20][21][22] As a result, he moved up more than 80 positions to World No. 131 in the rankings on 23 October 2023.[23] Following a quarterfinal showing at the Sydney Challenger he reached the top 130 in the rankings and 13th in the 2023 Next Generation ATP Finals race.[24]
Following reaching the quarterfinals with wins over Arthur Cazaux and fourth seed Luciano Darderi at the 2025 Almaty Open, Mochizuki reached the top 100 in the singles rankings on 20 October 2025.[33]
^ ab"日本男子ジュニア初４強の望月慎太郎、決勝進出逃す" [Shintaro Mochizuki, the first Japanese junior male to reach the semi-finals, fails to advance to the finals]. nikkansports.com (in Japanese). 8 June 2019. Retrieved 19 October 2023.
^"第32回第一生命全国小学生テニス選手権大会 男子シングルス" [The 32nd Dai-ichi Life National Elementary School Tennis Championships, Boys' Singles] (PDF). jta-tennis.or.jp (in Japanese). Retrieved 19 October 2023.
^"N高・望月慎太郎さん、「全仏オープン・ジュニア」でベスト4" [Shintaro Mochizuki of N High School reaches semifinals at French Open Junior]. nnn.ed.jp (in Japanese). 17 June 2019. Retrieved 19 October 2023.
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