Haynie enjoyed her biggest moments in the sun in 1974, when she won the U.S. Women's Open and LPGA Championship. She is one of only three players to sweep those events in a single year (along with Mickey Wright, 1961, and Meg Mallon, 1991).
Haynie was born in Fort Worth, Texas, and made a fast start in the game by winning the Texas Amateur in 1958 (at age 15) and 1959. She turned pro in 1961 and claimed her first victory in 1962 at age 18.
Haynie won at least one tournament every year for 14 years starting in 1962, claiming 39 titles in that span. She finished in the top five on the money list 11 times and was second five times. Though Haynie never earned the money title, she took Player of the Year honors in 1970.
Her best year, however, was 1974, when she captured a career-high six victories, including the only two major championships then contested. First, she beat JoAnne Carner by two strokes to win her second LPGA Championship (the first came in 1965).
Then, at La Grange Country Club outside Chicago, Haynie pulled off one of the most dramatic finishes in U.S. Women's Open history. She birdied the last two holes to win by one stroke, sinking a 75-foot putt on the 17th and a 15-footer on the 18th.
Hampered by arthritis and knee surgery, Haynie retired twice and successfully came back each time. After sitting out most of 1977-80, she won three events in 1981 and 1982, finishing second on the money list the latter year. Sidelined again from 1985-87, Haynie returned for 1988 and 1989 to surpass $1 million in career earnings before calling it quits for good.
Haynie finished with a total of 42 victories, tied with Carner for seventh best all time. The Texan was known primarily as a very straight driver and steady player, hitting fairways and greens with regularity.