(Makes clear throughout this is Ronaldo's last World Cup)By Michael ChurchDALLAS, July 5 : Cristiano Ronaldo admitted this World Cup will be his last and stressed he leaves with no regrets ahead of Portugal's last-16 clash with neighbours Spain in Dallas on Monday.The 41-year-old, playing at a record sixth World Cup, made the comment at the end of a press conference in which he insisted he would end his trophy-laden career on his own terms. "Let this be my last World Cup; it is my last World Cup, and I hope tomorrow won't be my last match," he said before departing to a round of applause from journalists.The former Manchester United and Real Madrid forward had earlier refused to confirm the tournament would be his last, even though he will be 45 when the next tournament is played in 2030."