On August 7, 1934 — St. Louis Cardinal Dizzy Dean becomes the first pitcher to reach 20 wins this season with a 2 – 0 shutout over the Cincinnati Reds . @ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF90YWdzIiwic2V0dGluZ3MiOnsiYmVmb3JlIjoiIiwiYWZ0ZXIiOiIiLCJsaW5rX3RvX3Rlcm1fcGFnZSI6Im9uIiwic2VwYXJh
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Source: Historical record