question: Hvornår starter the us open tennisturnering?
context: US Open (tennis)
  Siden 1987 har US Open kronologisk set været årets fjerde og sidste Grand Slam-turnering i året. De tre andre turneringer er i kronologisk rækkefølge Australian Open, French Open og Wimbledon. US Open begynder den sidste mandag i august og fortsætter i to uger, hvor den midterste weekend falder sammen med den amerikanske Labor Day-ferie.
context_en: US Open (tennis)
  Since 1987, the US Open has been chronologically the fourth and final Grand Slam tournament of the year. The other three, in chronological order, are the Australian Open, the French Open, and Wimbledon. The US Open starts on the last Monday of August and continues for two weeks, with the middle weekend coinciding with the U.S. Labor Day holiday.
title_en: US Open (tennis)