Stoner has a sterlig 1.50 ERA in his five PWL appearances. The chart below compares Stoner's performance in AA, the Arizona Fall League and the PWL seasons.
-Stoner always throws strikes. This is good.
-Stoner's K/rate has stagnated below 7/9 innings. This is less good.
-Stoner is durable. This is also good.
I'm left wondering whether the decline in Stoner's walk rate in the PWL and the associated drop in his ERA isn't due more to the level of play in the league than any dramatic change or improvement in his own pitching.