Claim: China's Zhang Nan and Zhao Yunlei ranked 1st in the qualifying round of the mixed doubles event of the  2016 Summer Olympics which was held May 4, 2015 and May 1, 2016.
Evidence: The Olympic qualification period takes place between May 4, 2015 and May 1, 2016, and the Badminton World Federation rankings list, scheduled to publish on May 5, 2016, will be used to allocate spots.