The euro slipped with emerging-market currencies as Greek voters' rejection of austerity sent investors to the relative safety of Treasuries and the yen. Chinese stocks jumped after the country stepped up efforts to arrest a $3.2 trillion selloff.

The euro was weaker against all 16 major peers by 11:27 a.m. in Tokyo, dropping at least 0.5 percent versus the dollar and gold, and 0.8 percent to the yen. The yield on 10-year Treasuries plunged nine basis points, while rates on Australian and Japanese notes also fell. Asian shares outside China dropped amid the flight to safety. The Shanghai Composite Index advanced 3.7 percent in early trade after the government joined with brokerages to defend the equity market. Malaysia's ringgit fell to a 10-year low.