[1] A native of Springfield, Ohio, Nancy Warren used to play baseball with her four brothers in their home's backyard at an early age.

In her new team she had plenty of run support from her teammates, thanks to a lineup that included the explosive bats of Betty Foss, Jean Geissinger, Katie Horstman, Dorothy Schroeder and Joanne Weaver, which led to her best ever winning record of 17–6 (.739).

[1][2][8][9][10][11] Warren was traded to the Kalamazoo Lassies in 1954, during what turned out to be the All-American Girls Professional Baseball League's final season.

In the first round, the team disposed of the South Bend Blue Sox (48-44 record) in three games and later faced Fort Wayne in the best-of-five series.

In the playoffs, Cordes hurled and lost the opener to South Bend, but Warren and Elaine Roth won games two and three, respectively.

[1][3][11][12][13] In Game 1 of the AAGPBL Series, the Kalamazoo Lassies defeated the visiting Fort Wayne Daisies 17–9 behind a four-hit, seven strong innings from June Peppas, who also helped herself by hitting 2-for-4, including one home run.

Pitching star Maxine Kline, who had posted an 18–7 record with 3.23 ERA for the Daisies during the regular season, gave up 11 runs in six innings and was credited with the loss.

In her final season, did not commit an error all year to lead all pitchers in the league with a perfect 1.000 fielding percentage .In addition, she was one of seven pitchers to collect 100 or more wins in the circuit, ranking 6th on the all-time list behind Helen Nicol (163), Jean Faut (140), Joanne Winter (133), Dorothy Collins (117), Maxine Kline (116), and over Connie Wisniewski (107).

[1] Nancy Warren is part of the AAGPBL permanent display at the Baseball Hall of Fame and Museum in Cooperstown, New York, opened in 1988, which is dedicated to the entire league rather than any individual player.