The knuckleball grip used by Boston Red Sox pitcher Steven Wright. Good fingernails are important. Marvin Fong /The Plain Dealer /Landov hide caption toggle caption Marvin Fong /The Plain Dealer /Landov The Two-Way The Knuckleball Can Devastate, So Why Don't All Pitchers Throw It? August 14, 2013 Teams haven't typically tried to develop knuckleballers and players haven't usually wanted to throw the pitch. But now the Baltimore Orioles are teaching the knuckleball to three minor league pitchers. A physics expert and fan of the pitch wonders whether this could be the start of a "knuckleball era."