MADRID — Atletico Madrid's Brazil-born forward Diego Costa has signed a letter underlining his intention to play for adopted country Spain. “The player communicates in the letter addressed to Julio Cesar Avellada, secretary general of the Brazilian soccer federation, his wish to be available to the Spanish national team,” the Spanish soccer federation told the domestic website Tuesday. “Diego Costa will be able to play for Spain ... if the coach (Vicente del Bosque) deems it opportune.” Costa, 25, who has Brazilian and Spanish passports, has been in excellent form for Atletico this season and is the top scorer in La Liga. — Reuters