Task: Text Categorization
Input (English): Text:  Xenia Knoll (born 2 September 1992 in Biel) is a Swiss tennis player.Knoll has won two singles and nine doubles titles on the ITF tour in her career. On 14 April 2014 she reached her best singles ranking of world number 353. On 11 November 2013 she peaked at world number 269 in the doubles rankings.Knoll made her WTA tour debut at the 2013 Budapest Grand Prix with a direct entry into the main draw losing in straight sets to the former world-ranked number 11 Shahar Pe'er of Israel.
Output (English): 4