In an 0-2 count, he wheeled on a 95 mph fastball from right-hander Casey Legumina and lined it into the Crawford Boxes. Walker looked toward his dugout and screamed on his way to first base.

The two-wheeled walker has front wheels and backsliders, making it easier to maneuver. But, it is less stable and needs more cognitive effort to handle. The four-wheeled walker (also called a ...