A unique snap shot by photographer jib661 posted on Reddit a few days ago . By focusing on the ground between the pitcher and the batter, he took continuous shots of the sequence until he got a few where the ball itself was in focus.
He describes “I prefocused between the pitcher/catcher, and shot on continous (out of about 800 frames, i had 3 in focus). It was shot with a Canon 300mm 2.8 on a 1D MKII. The lens was about 1.5 inches from the fence.”