Round	1	had	2507	players		
Round	2	had	2057	players, which is	82.05%	of the previous round
Round	3	had	1687	players, which is	82.01%	of the previous round
Round	4	had	1398	players, which is	82.87%	of the previous round
Round	5	had	1147	players, which is	82.05%	of the previous round
Round	6	had	932	players, which is	81.26%	of the previous round
Round	7	had	776	players, which is	83.26%	of the previous round
Round	8	had	642	players, which is	82.73%	of the previous round
Round	9	had	543	players, which is	84.58%	of the previous round
Round	10	had	450	players, which is	82.87%	of the previous round
Round	11	had	385	players, which is	85.56%	of the previous round
Round	12	had	325	players, which is	84.42%	of the previous round
Round	13	had	274	players, which is	84.31%	of the previous round
Round	14	had	226	players, which is	82.48%	of the previous round
Round	15	had	193	players, which is	85.40%	of the previous round
Round	16	had	166	players, which is	86.01%	of the previous round
Round	17	had	142	players, which is	85.54%	of the previous round
Round	18	had	116	players, which is	81.69%	of the previous round
Round	19	had	105	players, which is	90.52%	of the previous round
Round	20	had	94	players, which is	89.52%	of the previous round
Round	21	had	82	players, which is	87.23%	of the previous round
Round	22	had	68	players, which is	82.93%	of the previous round
Round	23	had	61	players, which is	89.71%	of the previous round
Round	24	had	50	players, which is	81.97%	of the previous round
Round	25	had	45	players, which is	90.00%	of the previous round
Round	26	had	40	players, which is	88.89%	of the previous round
Round	27	had	32	players, which is	80.00%	of the previous round
Round	28	had	28	players, which is	87.50%	of the previous round
Round	29	had	26	players, which is	92.86%	of the previous round
Round	30	had	24	players, which is	92.31%	of the previous round
Round	31	had	21	players, which is	87.50%	of the previous round
Round	32	had	18	players, which is	85.71%	of the previous round
Round	33	had	16	players, which is	88.89%	of the previous round

It's cool when data bear out a hypothesis 

  Looks like the earlier rounds didn't have the expected advancement rates due to deadbeats, folks dropping out of the tournament and MAYBE something that had to do with skill differential.  But now we're sitting right around 87.5% which would be the expected rate of advancement.