 Complete the following phrase:  After three years in the youth team, Totti made his first appearance for Romas senior side in Serie A at the age of 16, when coach Vujadin Boškov called him up in the 20 away victory against Brescia on 28 March 1993. In the following season under Carlo Mazzone, Totti began to play more regularly as a second striker, and scored his first goal on 4 September 