Akiko Morigami upset third-seeded Maria Kirilenko of Russia 1-6, 6-2, 7-6 (7-3) on Monday in the first round of the Japan Open, the day's biggest result.
Roger Federer of Switzerland gives his autograph to fans after a training session for the Japan Open at the Ariake Colosseum in Tokyo on Monday.
AP PHOTOMorigami's compatriots were not necessarily as fortunate, however.
Kenneth Carlsen of Denmark rallied to defeat local hope Gouichi Motomura 6-7 (5-7), 6-3, 6-2.
No. 1-ranked Roger Federer has a first-round bye and will enter the $940,000 tournament in the second round Wednesday against either Spain's Fernando Vincente or a qualifier.
Marcos Baghdatis, seeded No. 2, withdrew because of a shoulder injury he sustained in practice at the Thailand Open last week.
In other men's first-round matches, Takeo Suzuki cruised to a 6-2, 6-2 win over Germany's Simon Greul, Jiri Novak of the Czech Republic defeated compatriot Robin Vik 4-6, 6-4, 6-4, while Taiwan's Wang Yeu-tzuoo downed American Kevin Kim 6-3, 6-1.
Argentina's Edgardo Massa overpowered Konstantinos Economidis of Greece 6-1, 6-3; Frank Dancevic of Canada defeated Brazil's Marcos Daniel 6-4, 6-4; and Kristian Pless of Denmark was a 6-3, 6-4 winner over South Africa's Rik de Voest.