From MLB Power Pros Wiki

Overview

Fielder Attributes

Trajectory

• Scale: 1-4
• Determines the angle at which line drives are hit.

Contact - Can sometimes be called Hit for Avg.

• Contact: 1-15
• Represents the size of the player's hitting cursor. Affects both normal and big swing modes.

Power

• Scale: 0-255
• Determines how hard the player is able to hit balls.

Run Speed

• Scale: 1-15
• Affects how well the player rounds the bases as well as speed on the field.

Arm Strength

• Scale: 1-15
• Determines how strong a player can throw when fielding. Affects pick-off throws for pitchers as well.

Fielding

• Scale: 1-15
• Affects run speed and jump height on the field, as well as the delay before throwing the ball. Also affects accuracy of throws.

Error Resistance

• Scale: 1-15
• Represents sure-handedness. Players high in this attribute are not only less prone to errors, but less likely to deflect hard-hit balls or let them go by. Affects the ability to stop comebackers for pitchers and chances of passed balls for catchers.

Pitcher Attributes

Top Speed

• Scale: 49-105mph
• Highest possible speed of 4SFB.

Control

• Scale: 0-255
• Likelihood of pitch hitting the target. Also affects chances of misthrowing a pitch.

Stamina

• Scale: 0-255
• Affects number of pitches a pitcher can throw before tiring.

Pitch Types

See Pitch Types