Li equals best

China's Li Na has equaled her national ranking record while two players head to Doha at new career-highs, according to the Sony Ericsson WTA Tour singles rankings on Monday.

Despite not playing last week, Li rose from No 16 to No 15 this week, her new career-high and equal to the previous Chinese world ranking record, set by Zheng Jie this year. Li went up after Ana Ivanovic fell from No 14 to No 22.

Meanwhile, American Venus Williams dipped from No 4 to No 7 and Russia's Vera Zvonareva fell from No 7 to No 9 - which paved the way for two of the game's brightest young stars to rise up to new career-highs. Caroline Wozniacki went from No 6 to No 4 and Victoria Azarenka went from No 8 to No 6. Both are making their very first appearances at this week's Sony Ericsson Championships in Doha.