Since home plate is generally in the southwest corner to avoid glare in the batter's eyes, a southpaw's pitching hand is to the south.
Other Word Forms
Origin of southpaw
- From the practice in baseball of arranging the diamond with the batter facing east to avoid the afternoon sun. A left-handed pitcher facing west would therefore have his pitching arm toward the south of the diamond
From American Heritage Dictionary of the English Language, 5th Edition