Roberto Martinez quits Portugal immediately after devastating World Cup exit

Roberto Martinez has confirmed his immediate resignation as Portugal head coach following the team's World Cup exit. The decision follows a round of 16 defeat to Spain in Texas, which prevented the squad from reaching the quarter-finals. Martinez departs the role after three-and-a-half years in charge, stepping down immediately after the tournament. The exit comes after a match described as dull and devastating, marking the end of his tenure with the national team.