At age 41, his body is telling him the time has come, the Swiss tennis great said in a video message released on Thursday. Federer has won more than 100 titles, including 20 Grand Slam singles wins.
Chinese President Xi Jinping and Russia's Vladimir Putin are expected to meet on the sidelines of a summit in Uzbekistan, a group formed by Beijing and Moscow as a counterweight to U.S. influence.
Authorities didn't immediately say whether a woman detained in South Korea on two murder charges from New Zealand was the mother of two dead children found last month in abandoned suitcases.
Her coffin left Buckingham Palace for the last time Wednesday, borne on a horse-drawn carriage and saluted by cannons and the tolling of Big Ben, in a solemn procession to Westminster Hall.
There have been fresh clashes between Azerbaijan and Armenia, two former Soviet republics, in recent days. They've clashed with each other for decades over a long-running territorial dispute.