Spain's David Ferrer returns a shot during the men's second round against France's Edouard Roger-Vasselin at 2013 Portugal Open in Lisbon, Portugal, May 1, 2013. Ferrer won the match 2-1. (Xinhua/Zhang Liyun)

Spain's David Ferrer gestures to the audience after the men's second round against France's Edouard Roger-Vasselin at 2013 Portugal Open in Lisbon, Portugal, May 1, 2013. Ferrer won the match 2-1. (Xinhua/Zhang Liyun)

France's Edouard Roger-Vasselin returns a shot during the men's second round against Spain's David Ferrer at 2013 Portugal Open in Lisbon, Portugal, May 1, 2013. Ferrer won the match 2-1. (Xinhua/Zhang Liyun)

Spain's David Ferrer returns a shot during the men's second round against France's Edouard Roger-Vasselin at 2013 Portugal Open in Lisbon, Portugal, May 1, 2013. Ferrer won the match 2-1. (Xinhua/Zhang Liyun)

Spain's David Ferrer serves during the men's second round against France's Edouard Roger-Vasselin at 2013 Portugal Open in Lisbon, Portugal, May 1, 2013. Ferrer won the match 2-1. (Xinhua/Zhang Liyun)

Spain's David Ferrer returns a shot during the men's second round against France's Edouard Roger-Vasselin at 2013 Portugal Open in Lisbon, Portugal, May 1, 2013. Ferrer won the match 2-1. (Xinhua/Zhang Liyun)

Spain's David Ferrer returns a shot during the men's second round against France's Edouard Roger-Vasselin at 2013 Portugal Open in Lisbon, Portugal, May 1, 2013. Ferrer won the match 2-1. (Xinhua/Zhang Liyun)