Yahoo! Fantasy Baseball PLUS uses the following positional breakdowns:
| Pos | What It Means | Who is Eligible |
| 1B | First Base | Only first basemen |
| 2B | Second Base | Only second basemen |
| 3B | Third Base | Only third basemen |
| SS | Shortstop | Only shortstops |
| C | Catcher | Only catchers |
| CI | Corner Infield | Any first or third baseman |
| MI | Middle Infield | Any second baseman or shortstop |
| IF | Infield | Any infielder |
| LF | Left Field | Only left fielders |
| CF | CenterField | Only center fielders |
| RF | Right Field | Only right fielders |
| OF | Outfield | Any left, center, or right fielder |
| Util | Utility | Any non-pitcher |
| SP | Starting Pitcher | Only starting pitchers |
| RP | Relief Pitcher | Only relief pitchers |
| P | Pitcher | Any starting or relief pitcher |
| DL | Disabled List | Any player on real-life DL |