About Reinaldo Merlo
Reinaldo Carlos Merlo, better known as Mostaza, is an Argentine former football coach and former player, who played as a midfielder for Club Atlético River Plate throughout his entire career, while he is also idol as a coach for Racing Club. In 1999, Merlo commanded Atlético Nacional of Colombia during the first half of the season; albeit successful, his managerial choices proved unpopular, and he resigned from his position. Merlo recalls fondly that both his debut (in 1969) and his first goal were both against Estudiantes. He won seven titles during his time at the club and made 42 appearances in the Superclasico, more than any other player in history. In 2009, he became the manager of Rosario Central but left the club on 15 April 2009 after only five games in charge (won three, tied one and lost one) because of personal problems with the player Ezequiel González.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.