The term ‘XY’ can be traced back to the 1880s when Chicago Daily News sports reporter coined the term when covering the then-named Chicago White Stockings games.  Chicago, where the ballpark faced east and west, with home plate to the west, so that a not so common pitcher threw from the ‘X’ side with ‘Y’, hence,  these not so common pitchers came to known as ‘XYs’.

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