First of all Men are Stronger and there is like five times more men golfers then women golfers in the US OPEN. Also they DO combine LPGA and PGA in some tournaments, havn't you heard that Michele Wie (the quiter) did that tournamet but did not reach the cut? Also Anika joined to and she did make it but she was not even close to first place, there is a big difference between men and women.
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The LPGA is the Ladies tour, where as the PGA is for men. The Ladies tour would occasionally only play 54 holes, whereas the PGA Tour always plays 72 unless there is a washout or bad weather. The Ladies tour also plays shorter holes than the men would. Unfortunately the Ladies tour isn't as popular as the mens game so there is quite a lot less money in the prize funds and the galleries would not be as big.