Barcelona and Argentina striker Sergio Aguero on Wednesday announced his retirement from football at a tearful press conference, just over a month after the 33-year-old was diagnosed with a heart problem. “I have decided to stop playing professional football. It is a very hard moment but I am happy with my decision. My health comes first,” said Aguero, who enjoyed 10 highly successful years at Manchester City before leaving at the end of last season. He signed a two-year deal with Barcelona but had made just five appearances, scoring one goal...