Crop Circles

[Coach&Blue]

The small circles you are referring to are used for infield practice. During pre-game activities, 2 coaches hit infield practice. The coach hitting in the first base circle hits to the 3B and SS, while the coach in the third base circle hits to 2B and 1B. The circles are put there so the coaches do not ruin the grass because of repeated use and keeps the coach off the dirt and lines.