By Karolos Grohmann RIO DE JANEIRO (Reuters) - Organizers for the Rio Olympics have delivered on their promises, the International Olympic Committee (IOC) said on Sunday, playing down persistent problems that have plagued the first South American Games since the start. Games organizers have had to deal with a seemingly endless list of issues affecting venues and infrastructure alike as the country grapples with its worst recession since the 1930s. From the day of the opening ceremony on Aug. 5, thousands of empty seats have been visible at many venues despite assurances from organizers they would be filled eventually. More...