Which was Ronaldo's first professional club?

Cristiano Ronaldo’s first professional club was Sporting CP. He joined Sporting’s youth academy from Nacional in Madeira and progressed rapidly through the club’s age-group teams.

At 17, Ronaldo made his first official first-team appearance for Sporting on 14 August 2002, entering against Inter Milan in a UEFA Champions League qualifying match. He later made his Portuguese top-flight debut against Braga and scored twice against Moreirense in his next league appearance.

A common mix-up is Manchester United, where Ronaldo became a global star after signing in 2003. Sporting CP, however, was the club that developed him and gave him his professional breakthrough. Some detailed records also mention Sporting CP B, where he made his first domestic senior appearance, but Sporting CP is the standard canonical answer for his first professional club.