To master distance control, putt up and down a “ladder”. Mark various distances, each one foot from the hole (so, mark distances at 1ft, 2 ft, 3 ft..and so on…) and putt up and down this line to practice putts of various lengths. You can do this uphill, downhill or sidehill.
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Good advice. I usually do 3′, 6′, 12′ (or some more random version of that). In other words, Once I get a basic idea of green speed (~10 putts), I try to not hit any two putts from the same place.
I was at the LPGA event in San Francisco and spent a fair bit of time watching the ladies practice. Almost all (especially Ms. Wie) needed this distance sensitivity training.