The hardest pitch to hit in Major League Baseball is often considered to be the fastball. Pitchers who can throw a fastball consistently at high speeds, often exceeding 100 miles per hour, make it extremely challenging for batters to react in time to make solid contact.
"Once it gets older, the red ball will swing more and even start to reverse swing after a certain stage. In that way the red ball helps the bowlers as they have to negotiate the swing in the initial overs unlike the white ball in which the batsman comes at you from ball one.