This thread keeps track of major upsets... #1: Du Li was denied CHN's first gold in women’s 10m air rifle when the heavy favorite finished fifth and left in tears.
#2: Japanese double gold medalist Ryoko Tani, who hadn't been beaten in a major international competition since the Atlanta Games in 1996, only grabbed bronze in 48kg Judo.
Ya, that's HUGE! Possible one brewing: Sweden women's soccer team (ranked #3) might not qualify for the QF. Depends on the 3rd set of group matches. They're probably done if Canada beats them
#3: Federer was beaten by Blake 46 67(2) in QF. The 12-time Grand Slam champion is out from his 3rd Olympic.