From wikipedia
"On March 19, in Springfield, Ohio, I ran 526 balls, a record that still stands. I was playing a two-hundred-point match against an amateur by the name of Earl Bruney in the East High Billiard Club. He made three balls off the break, then I ran two hundred and just kept going. The run took two hours and ten minutes, which means that over the span I averaged four balls a minute. I finally missed a difficult cut shot, but by that time I was weary; it was almost a relief to have it come to an end. There were about three hundred people in the audience, and one of them was an attorney who prepared an affidavit attesting to the validity of my claim to a new record. A few days later, the BCA gave its stamp of approval."