William Rejchtman Vinciguerra (born 10 February 2007) is a Swedish tennis player.

[1] He started playing tennis at a young age and was coached by his father Robert, as well as Thomas Högstedt, who previously trained Maria Sharapova and Caroline Wozniacki.

[5] He made his junior Grand Slam debut at the 2024 Australian Open.

[6] He competed in the junior events at the 2024 Wimbledon Championships where he also practised with Swedish ice hockey player William Nylander.

[7] Alongside Leo Borg, he was awarded a wildcard into the men's doubles at the 2024 Swedish Open for his ATP main draw debut.