Summer Olympic Games federal government; the country's economic crisis; health and safety concerns surrounding the Zika virus and significant pollution in the Guanabara Bay; and a state-sponsored doping scandal involving Russia, which affected the participation of its athletes in the Games. Tokyo, Japan will host the 2020 Summer Olympics, making it the first Asian city to host the Olympic Games twice. Forty-two sports, spanning 55 disciplines, have been part of the Olympic program at one point or another. Twenty-eight sports have comprised the schedule for three of the recent games, 2000, 2004, and 2008 Summer Olympics. Due to the removal of baseball and
Olympic Games city hosting the next Olympic Games. The next host nation then also briefly introduces itself with artistic displays of dance and theatre representative of its culture. As is customary, the last medal presentation of the Games is held as part of the closing ceremony. Typically, the men's marathon medals are presented at the Summer Olympics, while the cross-country skiing mass start medals are awarded at the Winter Olympics. A medal ceremony is held after each Olympic event is concluded. The winner, second and third-place competitors or teams stand on top of a three-tiered rostrum to be awarded their respective medals.