Michael Antonius (born January 1, 2010) is an American tennis player. He has a career high ATP singles ranking of No. 622 achieved on September 14, 2026 and a career high ATP doubles ranking of 1,173 achieved on April 13, 2026.
He also has a career-high ITF junior combined ranking of No. 3 achieved on July 13, 2026.
Early life Antonius was raised in Buffalo, New York. His father, who is Norwegian, is a psychologist at the University at Buffalo. Antonius trains at the USTA National Campus in Orlando, Florida.
Career In 2024, Antonius won the boys' singles title at the Petits As in France, becoming the first American to do so since Victor Lilov in 2018.
2026 Antonius won his first ITF singles title at the M25 in Bakersfield, California, becoming the youngest American male to win an ITF title at the age of 16. He reached the 2026 French Open boys' singles final, but lost to Guto Miguel of Brazil.
Junior Grand Slam finals Singles: 1 (1 runner-up) ResultYearTournamentSurfaceOpponentScoreLoss2026 French OpenClay Guto Miguel3–6, 4–6
Doubles: 1 (1 runner-up) ResultYearTournamentSurfacePartnerOpponentScoreLoss2026WimbledonGrass Andrew Johnson Guto Miguel Žiga Šeško1–6, 4–6
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