Back when Arrieta won the Cy Young, he threw four changeups and 15 curves out of every 100 pitches. Which is to say he threw four changeups and 15 curves per game.
This year, however, he’s thrown the change of pace at a 7.5 percent rate, nearly double that of previous seasons. He’s also increased his curve usage from 12.1 percent to 17.4 percent.
