Tennis - Serena crashes out of US Open, loses No. 1 ranking

Karolina Pliskova of the Czech Republic celebrates after defeating Serena Williams 6-2, 7-6 in the US Open semifinals. (AFP Photo/ELSA)

- Serena Williams crashed out of the US Open on Thursday, her semi-final defeat to Karolina Pliskova costing her a shot at a 23rd Grand Slam title and a record 187th straight week at number one. Pliskova, the 10th-seeded Czech playing in her first Grand Slam semi-final, triumphed 6-2, 7-6 (7/5) and will face either Caroline Wozniacki or Angelique Kerber, who will supplant Williams atop the summit when the new world rankings are released on Monday.