During his 2013 Mariners season where he finished 3rd place finish in the AL Cy Young voting, Iwakuma began to show off his masterful control.
His BB/9 (1.72) was the 3rd lowest in the American League and his WHIP (1.01) was the 2nd lowest in the AL that year.
That kind of success with those numbers was just the beginning of would be some of the most accurate throwing in the game.
In 2014, Iwakuma dropped his BB/9 to 1.06 which was good for the 2nd best in all of baseball. It also helped his WHIP stay near 1.