At 19 age, Cordes entered the league in 1950 with the Lassies, based in
Muskegon, Michigan. She pitched in nine games and was 0–5 on a team made up mainly of rookies from the traveling teams. It was a very bad season for the Lassies, who relocated to
Kalamazoo, Michigan, in the middle of the year, and posted the worst record of the league with 36 wins, 73 losses and two ties. Although never credited with a
no-hitter in the midseason because the contest ended in a 0–0 tie, she later defeated the
South Bend Blue Sox, 1–0, behind a two-hit
shutout. After pitching in the two cities, she joined the
Racine Belles late in the season. She combined for a 5–10 record with a 3.63
earned run average, giving up 76
walks while
striking out just 23 in 119 innings of work. Cordes stayed with the Belles when the team moved from
Racine, Wisconsin, to
Battle Creek, Michigan, for the 1951 season, but was sent back to the Lassies during the midseason. She finished 1951 with a solid 3.63 ERA, despite her 3–15 record for two helpless teams. Cordes enjoyed a career year in 1952, pitching 34 consecutive
scoreless innings and going the whole season without ever being
relieved in her 24
starts. She finished with a 16–8 record and a 1.44 ERA and lowered drastically her numbers of the previous season, cutting her walks from 96 to 52, by increasing her strikeouts from 70 to 84, and allowing 12 fewer
hits (168 to 156) in 34 more innings (179 to 213). Besides this, she finished fifth in the league in innings, third in strikeouts, sixth in wins and second in ERA to
Jean Faut, who set an all-time, single-season record of 0.93 (.51 ahead of Cordes). Cordes also appeared in the 1952 midseason All-Star Game as a member of the
All-Star Team, which faced the South Bend Blue Sox, the league's 1951 playoff champions. The All-Stars prevailed, 7–6, when
Betty Foss scored the eventual winning run on an
RBI-
single by
Doris Sams in the top of the 9th inning. Then Cordes retired South Bend in the bottom of the ninth to earn the
save. Kalamazoo improved to a 49–61 record in that season. When the 1953 season opened, Cordes felt more confident about her game. She won three of the first four victories of Kalamazoo, already achieving her wins mark from the previous season. By then, she depended on a good
fastball and a
curve, but also possessed a
knuckler that baffled opposite hitters who tried to analyze her pitches. Cordes finished 13–11 with 106 strikeouts and a 1.98 ERA, and again ranked among the leaders in ERA (3rd), strikeouts (5th), complete games (20, tied for 8th), shutouts (six, 2nd) and innings pitched (218, 10th). In the first round of the playoffs, Kalamazoo defeated the
Fort Wayne Daisies and advanced to the best-of-three game Championship Series only to lost to the
Grand Rapids Chicks, 2–0. In her last season, Cordes went 12–7 with 86 strikeouts and a 4.58 ERA, ending in fourth place both in strikeouts and wins (tied). She was rewarded with her second All-Star berth and a trip to the best-of-five game Championship Series. Previously in the playoffs, Kalamazoo dispatched South Bend in three games and the Daisies did the same with the Chicks. ==1954 Championship Title==