She was the first woman to officially win the Boston Marathon, 1972. Alongside Beth Bonner, Kuscsik became the second American woman to complete a marathon in under three hours, running a time of 2:56:04 at the 1971 New York City Marathon (Bonner did so in the same race with 2:55:22).
Kuscsik is a former American women's record-holder for a 50-mile run, through her run of 6:35:53 in 1977 in Central Park, New York. She continued running into her later years and was the first woman to finish the Empire State Building Run-Up in 1979, 1980 and 1981.
Before she took up running, she was New York State women's speed skating champion, New York State women's roller-skating champion, and New York State women's bicycling champion, all in same year. She was instrumental in influencing the U.S. Amateur Athletic Association, in late 1971, to increase its maximum distance for sanctioned women's races, leading to official participation by women in marathons, beginning at Boston in 1972.
- All results regarding marathon, unless stated otherwise
|1972||Boston Marathon||Boston, United States||1st||3:10:26|
|New York City Marathon||New York, United States||1st||3:08:41|
|1973||New York City Marathon||New York, United States||1st||2:57:07|
- "Nina Kuscsik". Distance Running. Retrieved 24 April 2015.
- N.Y. Road Runners site (results archive accessed via "Runner Tools") Retrieved 6 May 2012
- "RRCA Hall of Fame Inductees 1980 - 1989". Road Runners Club of America. Retrieved 6 May 2012.
- "Nina Kuscsik". New York Road Runners. Retrieved 25 April 2015.
- Robinson, Roger. "Women's Running Pioneers Kuscsik, Gorman Honored". Runner's World. Rodale Press. Retrieved 24 January 2017.
- Butler, Charles (October 19, 2012). "40 Years Ago, Six Women Changed Racing Forever". Runner's World. Retrieved 2 January 2016.
- "Boston Marathon History: Women's Open Champions". Boston Athletic Association. Retrieved 2 January 2016.
- 1973 World Marathon Rankings
- Murphy, Jen (February 3, 2009). "Climbing the Empire State Building". WSJ.com. Retrieved 6 May 2012.
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