Sara Errani's stay in Tokyo was a short one, as the fifth-seeded Italian was upset by New Zealand qualifier Marina Erakovic Tuesday in the first round of the Pan Pacific Open.
Top-seeded Samantha Stosur was the most notable among the five seeds to lose in first-round action at the Guangzhou Open on Tuesday.
Top-seeded Agnieszka Radwanska of Poland began her title defense in comfortable fashion by beating Polona Hercog of Slovenia 6-3, 6-3 in the Korea Open on Tuesday.
Former finalist Paul-Henri Mathieu notched a first-round victory Monday at the Moselle Open tennis event.
Second seed Alize Cornet was an easy opening-round victor Monday at the Guangzhou International tennis tournament.
Fifth-seeded American Varvara Lepchenko was an easy first-round winner Monday at the Korea Open women's tennis event.
Seventh-seeded Lucie Safarova was a hard- fought first-round winner Monday at the $1 million Pan Pacific Open women's tennis event.
Lin Zhu of China advanced to the second round of the Guangzhou Open by beating sixth-seeded Roberta Vinci of Italy 6-3, 7-6 (7) Monday.
Fifth-seeded Varvara Lepchenko of the United States advanced to the second round of the Korea Open by beating Olivia Rogowska of Australia 6-1, 6-2 Monday.
John Isner and Sam Querrey won singles matches Sunday as the United States completed a 5-0 rout of Slovakia in a Davis Cup playoff tie.
Favored Argentina won both matches on Sunday, rallying to defeat Israel 3-2 in a Davis Cup World Group playoff tie.
The Davis Cup World Group playoff between Serbia and India will be decided on Monday after the fifth and decisive singles match was suspended because of rain.
Mirjana Lucic-Baroni ended a 16-year title drought with a straight-set victory over former world No. 1 Venus Williams in Sunday's final at the Coupe Banque Nationale.
Sabine Lisicki won her first WTA title in three years by defeating Karolina Pliskova 7-5, 6-3 in the final of the Hong Kong Open on Sunday.
Sabine Lisicki beat Karolina Pliskova in straight sets Sunday to win the inaugural Hong Kong Open.
India's Rohan Bopanna and Leander Paes came back from two sets down to beat Ilija Bozoljac and Nenand Zimonjic in the doubles match and narrowed Serbia's lead to 2-1 in the Davis Cup playoff on Saturday.
Jo-Wilfried Tsonga and Richard Gasquet again played the heroes on Saturday, teaming for a doubles victory to lift France into the Davis Cup final while ending the Czech Republic's two-year championship reign.
Italy stayed alive in its Davis Cup semifinal against Switzerland after the duo of Simone Bolelli and Fabio Fognini rallied for a five-set doubles victory on Saturday.
Karin Knapp of Italy won her first career WTA title in her 12th year as a pro when she won the Tashkent Open by beating defending champion Bojana Jovanovski of Serbia in the final on Saturday.