It is different for each event. All things being equal, if there are 72 golfers in the tournament, the chances of winning are 1 in 72.
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The Nationwide Tour would be the tour before the PGA Tour, the top 25 on the Nationwide tour at the end of the season win PGA Tour cards.
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The PGA Tour is associated with the sport of golf.
PGA Tour of Australasia was created in 1973.
PGA Tour on USA was created in 1982.
PGA Tour on ABC was created in 1966.
PGA Tour on CBS was created in 1956.
Tiger Woods PGA Tour was created in 2003.
PGA Tour Network was created on 2005-06-09.
Tiger Woods' career earning on the PGA Tour is $87,832,539. (Source PGA Tour website)
Professional Golfers Association of America started in 1916.