premise: Fast bowler Dale Steyn left the field after bowling one ball of his eleventh over because of a left thigh strain, which appeared to be a recurrence of an injury which caused him to miss two domestic first-class matches leading up to the Test.
  The morning's play was restricted to an hour. The start was delayed by 90 minutes because of damp patches, which the Gauteng Cricket Board said were caused by wet hessian placed on the pitch overnight because groundsman Chris Scott was concerned that the surface was too dry and that it might break up on the fourth and fifth days.
  "After removing the covers this morning, there was a lot more moisture on the wicket than anticipated," officials explained.
  Despite the late start, the pitch looked good for batting on a hot, cloudless day and although there was grass cover it had a brown tinge.
   Why was the start delayed?
hypothesis: wet hessian placed on the pitch overnight