MADRID, SPAIN - MAY 04: Serena Williams of USA in action against Belinda Bencic of Switzerland during day two of the Mutua Madrid Open tennis tournament at the Caja Magica on May 4, 2014 in Madrid, Spain. (Photo by Julian Finney/Getty Images)

Madrid – World number one Serena Williams began the defence of her Madrid Open title on Sunday with a comfortable 6-2, 6-1 win over Swiss 17-year-old Belinda Bencic.

The 17-time Grand Slam champion was playing for the first time since suffering a shock defeat to Jana Cepelova in Charleston over a month ago, but showed no signs of rustiness to set up a second round meeting with China's Peng Shuai or Japan's Kurumi Nara.

Ruthless Williams won 21 consecutive points on Sunday on the way to her convincing victory. – Sapa-AFP