[vanoochka]

These odds aren't exact, but will get you in the ball park (or on the green, as the case may be).

In 1999, Golf Digest reported, "One insurance company puts a PGA Tour pro's chances at 1 in 3,756 and an amateur's at 1 in 12,750."
That same issue reported that the "odds of an amateur making two holes-in-one in a round are 9,222,500 to 1."