Who became the youngest male ever to win the US Open at the age of 19 years and 28 days with a final victory against Andre Agassi?

Explanation

American tennis star Pete Sampres (born 1971) stopped his career in the fall 2002 after he had won his 14th Grand Slam title. Seven of his titles were won in the Wimbledon tournament (1993-1995, 1997-2000). In 1990 he became the youngest winner of the US Open at age 19. Sampras ranked as world number 1 for six years in a row in the period 1993-1998, which is a record. Today Sampras is considered one of the best male tennis players ever.