Each finger should be touching the seam from the pads or tips to almost the ball of each finger. The thumb should rest underneath the ball in the middle of those two fingers, finding the apex of the horseshoe part of the seam. The thumb needs to rest on that seam from the side to the middle of its pad. If the middle finger is used, more whipping action occurs, making the pitch go around 10 mph faster. This ball tends to move for the pitcher a little bit depending on velocity, arm slot angle, and pressure points of the fingers. Retired pitchers Greg Maddux and Pedro Martínez were known for their effective two-seamers.