Fifth seed Li Na snapped a three-match losing streak against former World No. 1 Jelena Jankovic, crushing the Serb 6-3, 6-0 to book her first U.S. Open quarterfinal since 2009, in what she described as one of the best matches in her career.

The 31-year-old Li, China's No. 1, played aggressively from the start, racing to a 3-0 lead in just seven minutes. She converted all seven break-point chances and fired 20 winners to Jankovic's seven.

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