Mosconi described it as :And there are reports from someone who seems to have been there that it was a hard shot on the six ball.
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 that 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."
Cohen, Stanley; Mosconi, Willie. Willie's Game: An Autobiography . Open Road Media. Kindle Edition.