If you have been following the Giants this season, you’ve probably seen some clips of Dominic Leone in action. The left-hander has a dominant slider, a pitch that he uses nine percent of the time. Last year, Leone used it just 4.6% of the time. He’s projected to use it as much as 35.6% of the time by 2020. The Giants have been encouraging pitchers to use the secondary pitch more often, so Leone has the potential to improve his strikeout rate if he can learn to control it.