It took Lehman many years to become a leading tour professional. He played on the PGA Tour with little success from 1983 to 1985, and was then obliged to play elsewhere for the following six seasons. This included time in Asia and South Africa and on the second tier Ben Hogan Tour in the United States. He regained his PGA Tour card by topping the Ben Hogan Tour's 1991 money list, and enjoyed unbroken membership of the PGA Tour from 1992 until shortly after he joined the Champions Tour. He was named PGA Tour Player of the Year in 1996.