Top seed Simona Halep of Romania has roared to victory in the WTA Shenzhen Open final, downing Switzerland’s Timea Bacsinszky in straight sets.

Halep, the number one seed and third-ranked female player in the world, dispatched number eight seed Bacsinszky 6-2 6-2 in 62 minutes in the $US500,000 ($A540,980) tournament to score her ninth WTA title.

“I wasn’t feeling very well before the match – I was a little bit sick – so I told myself I have nothing to lose, just go on court, be relaxed, stay focused and fight for every point,” Halep said in remarks posted on the WTA website.

“It worked and I felt really relaxed today,” she said. “I’m happy I could play better day by day and match by match here.

“I’m looking forward to playing like today in the next tournament, maybe even better.”

Bacsinszky, the world number 47, upset double Wimbledon winner Petra Kvitova on Friday to secure a place in the championship match, her first WTA final since 2010.