[8] Notably, Melcón refereed the first-ever La Liga match of Racing de Santander on 12 February 1929, which ended in a 0–2 loss to FC Barcelona.
[9] Notably, in the first leg of the 1930 Copa del Rey round of 16 between Real Betis and FC Barcelona on 20 April 1930, Melcón had a "scandalous refereeing" due to his partiality in favor of Barcelona, disallowing Betis' second goal and not giving a penalty after Barça's defender Enrique Mas cleared the ball with both hands before allowing Barça's equalizer from Ángel Arocha, who had received the pass from an offside position.
In total, he refereed four international matches between 1930 and 1936, all friendlies, including three involving the Portuguese national team, who won twice in Lisbon and lost the other in Porto.
[3] In 1955, Melcón provisionally served as the national coach of the senior team in two matches against France and England, which ended in a loss and a draw respectively.
[2][3][13] Until the 1960s, it was very common to give the reins of the national team not to renowned technicians, but to federations and even prominent journalists, such as Melcón and Pedro Escartín, the last two, after being referees.