According to Wikipedia (refer to the link, below), Tracy Austin was the youngest player to win a U.S. Open match, and, subsequently, that Championship at 16 years, 9 months in 1979.
Talha Jubair (Bangladesh) is the youngest player to play world cup cricket match. He was 17 years and 70 days in 2003 Cricket World Cup to play for Bangladesh
James O'Connor from Australia who kicked 5 penalties in their first match so hes the youngest rugby player to play in the world cup.
Hasan Raza of Pakistan was 14 years old when he played his first international cricket match.
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who is the youngest player in brazil204
Jetro Willems in Match the Netherlands - Denmark (0-1) on 09-06-2012
Amobi Okoye is the youngest football player
The youngest player on chelsea is mata
The youngest seeded Wimbledon men`s singles champion is Bjorn Borg (Sweden) was aged 17 years 19 days when he completed his first match in the 1973 tournament. The youngest seeded ladies singles player is Jennifer Capriati (USA) who was aged 14 years 89 days when she played her first match on 26 June 1990.