RIO DE JANEIRO， Aug. 7 (Xinhua) -- China's Zheng Saisai clinched her doubles victory on Sunday following her first round surprise win over fourth seed Agnieszka Radwanska of Poland in the singles of the Rio Olympic Games.

Zheng and Xu Yifan eased past Ukraine's twin sisters Liudmyla and Nadiia Kichenok 6-0， 6-3 in 84 minutes. Zheng， who was the last to qualify for the women's singles event on Tuesday following several drop-outs in the main draw， eliminated the world number five Radwanska 6-4， 7-5 in one hour and 39 minutes on Saturday.

In an earlier singles match， Wang Qiang of China lost to Russian 8th seed Svetlana Kuznetsova 6-1， 4-6， 6-0 in the first round.

Top seed and multi-Grand Slam winner Serena Williams opened her title defense with an easy first round 6-4， 6-2 win over Australian Daria Gavrilova on Sunday.

"It feels good to win my first match. No one wants to go out in the first round. It's always a little tricky and you always want to at least win a match， so I feel really good about that. It wasn't that easy. She has a lot of big wins and she plays really well，" she said.

Serena's older sister Venus， however， went out in the first round on Saturday， losing to Belgium's Kirsten Flipkens 6-4， 3-6， 7-5.

Second seed Angelique Kerber of Germany progressed， beating Colombian Mariana Duque-Marino 6-3， 7-5 to book a second round meeting with Canada's Eugenie Bouchard.

In the men's competition， defending champion Andy Murray beat Serbian Viktor Troicki 6-3， 6-2 while third seed Rafael Nadal also booked an easy win， beating Federico Delbonis of Argentina 6-2， 6-1 in the first round.

BRASILIA， Dec. 4 (Xinhua) -- China-Latin America relation should advance in the political and cultural spheres to match the trade and economic links built in recent years， said Argemiro Procopio， a professor of International Relations at the University of Brasilia， in an interview with Xinhua.

Procopio hailed China's Policy Paper on Latin America and the Caribbean， particularly its desire to lift the cooperation to a new level.

"China's commercial presence is clear everywhere， including in the shops and cars ... Made-in-China products have great added value， which is fantastic. However， culturally speaking， in Latin America China is still far behind the U.S. and Europe， as well as in politics，" he said.

Nevertheless， he feels this might be changing due to China's growing close ties with the region.

Chinese President Xi Jinping has recently paid state visits to Ecuador， Peru and Chile.

"This shows China's desire to play an ever greater role in the Pacific. Those countries were called distant neighbors but China wants to make them closer neighbors，" said Procopio.

This is shown in the paper， he said， which seeks to direct the ship of these relations towards a more secure and stable route.

According to Procopio， China launched the paper at a very opportune moment. "This is something few European countries have done. China took the lead and provided a symbolic fact though Latin America has been historically closely linked to Europe and the U.S.，" he explained.

Acknowledging that investments and exports were the first barriers to overcome for China and Latin America， given China's rising consumption needs， Procopio would now like to see common development in other areas.

For example， the cooperation between the two sides could be mutually beneficial through common development in science and technology.

Procopio， who has written a number of books about China， said that overcoming the lack of knowledge about each other would help both China and Latin America. 分享

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