question: Når starter us open i tennis?
context: US Open (tennis)
  Siden 1987 har US Open kronologisk vært årets fjerde og siste Grand Slam-turnering. De tre andre, i kronologisk rekkefølge, er Australian Open, French Open og Wimbledon. US Open starter den siste mandagen i august og fortsetter i to uker, med midthelgen sammenfallende med U.S. Labor Day-ferien.
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)