CHALLENGES MOUNT BEFORE THREE-DAY IOC MEETING

With five months to go until the Summer Olympics in Rio de Janeiro, the challenges keep piling up. From the Zika virus outbreak to severe water pollution, from behind-schedule venues to delayed metro lines, from sluggish ticket sales to cuts in services, from Brazil’s deep financial crisis to impeachment proceedings against its president, the buildup to South America’s first Games faces a long list of concerns. Rio’s final preparations and the status of anti-doping efforts in Russia and Kenya will top the agenda when the International Olympic Committee executive board holds a three-day meeting starting Tuesday in Lausanne, Switzerland.