Shintaro Mochizuki is a Japanese professional tennis player with a career-high singles ranking of No. 102 (September 2025) and a doubles ranking of No. 371 (October 2021). He is currently the second-highest-ranked Japanese player. Mochizuki made history by becoming the first Japanese male player to win a Grand Slam boys’ singles title at the 2019 Wimbledon Championships. He also achieved a career-high ITF junior combined ranking of No. 1 in July 2019.
1986: Kelly Jones Semifinalist
In 1986, Kelly Jones was the lowest-ranked Tokyo semifinalist at No. 479.
June 2, 2003: Shintaro Mochizuki's Birth
On June 2, 2003, Shintaro Mochizuki was born in Kawasaki, Kanagawa, Japan. His father named him "Shintaro" after novelist and politician Shintaro Ishihara.
October 2023: ATP 500 Japan Open Success
In October 2023, ranked No. 215, Mochizuki received a wildcard for the ATP 500 Japan Open. He won his first match at the ATP Tour level, beating Tomás Martín Etcheverry. He then defeated top seed Taylor Fritz, reaching his first ATP tour-level quarterfinal. He defeated Alexei Popyrin, reaching his first-ever semifinal, becoming the lowest-ranked Tokyo semifinalist since 1986. As a result, he moved up to World No. 131 in the rankings on 23 October 2023. He reached the top 130 in the rankings and 13th in the 2023 Next Generation ATP Finals race after reaching quarterfinal at the Sydney Challenger.
January 2025: Mochizuki Wins Challenger Title
In January 2025, Shintaro Mochizuki won his second Challenger title at the Open Nouvelle-Calédonie, defeating Moerani Bouzige in straight sets.
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