Carlos Alcaraz defeated Casper Ruud in four sets 6-4,2-6,7-6(1),6-3 to win the 2022 US Open and became the youngest major winner in the last 15 years.
#7 Carlos Alcaraz - 19 years, 129 days
Pete Sampras defeated fellow American Andre Agassi in the final in straight sets 6–4,6–3,6–2 to win the men's singles tennis title at the 1990 US Open.
#6 Pete Sampras - 19 years, 29 days
#5 Rafael Nadal - 19 years, 3 days
#4 Bjorn Borg - 18 years, 10 days
Mats Wilander won his maiden major title just a year after turning pro in 1981. In the 1982 French Open final, Wilander defeated Argentine Guillermo Vilas in four sets 1–6,7–6(6),6–0,6–4 to win his maiden major title at the age of 17.
#3 Mats Wilaner - 17 years, 293 days
Boris Becker’s love affair with Wimbledon started back in 1985 when he became the youngest champion in Wimbledon history after beating American Kevin Curren in four sets 6–3,6–7(7),7–6(3),6–4 in the final.
#2 Boris Becker - 17 years, 228 days
Michael Chang stunned Stefan Edberg and the world by winning the 1989 French Open final in five sets 6–1,3–6,4–6,6–4,6–2 to win his first and only grand slam title.
#1 Michael Chang - 17 years, 110 days