An oversimplified metric fails to acknowledge the way Tyler Duffey uses his remarkable curve ball. "...his curveball might look good" is exactly the point. Duffey is getting consistent whiffs on his curve because its trajectory starts right down the middle, just like his modest heater. But then, as it gets about fifteen feet from the plate, it breaks down and left sharply. Very few major league hitters can compensate for a break that sharp. The problem with the metric is that Duffey is bouncing his curve a foot behind home plate on purpose, not because he lacks control. The bend is so severe that he induces ridiculous swings that miss by an average of six inches. If you can do that without throwing a called strike, why would you ever spot the ball in the zone? We have seen Duffey bounce his curve three or four times in one at-bat. Even guys that manage to check their swing or foul off one or two usually can't keep it up for as long as Duffey can, and that's the beauty of his curve. Not only are hitters hard pressed to make contact, but it also sets them up for Duffey's modest fastball, which he mixes in and spots around the periphery. Here's the other thing: Duffey and Suzuki can tell if a guy is trying to adjust by holding up or resorting to a golf swing. When the golf swing comes out, here comes a fastball up. When the guy starts hesitating looking for the curve, suddenly 90mph blows right past him. I'm guessing that Duffey is perfectly capable of muscling up his fastball to 93 or 94, but there's no need. He'd rather throw a really precise heater at 90, mixed in with his other stuff. Command is the word most would use to differentiate Duffey's curve from others. Mastery is more apt. Duffey has such total confidence in his bender (Bender, nickname??), he is completely comfortable using it in any situation, including count 3-2, game on the line situations, where 9 of 10 pitchers will go with the trusty heater, and hitters know it. With Duffey, they literally have no clue what's coming, but they won't like it. Bouncer? Fastball in a corner? Back door breaking ball? Two-seamer fading away? Change-up? I've even seen him throw his curve deliberately high to a lefty, because the hitter hesitates, no-way man, before oh-drears, it's gonna be a strike. Whiff. Now for what will sound like hype, but it's not. Duffey's curve has been compared to Kershaw's and Greinke's because of the rpm's, which sit around 1600. Given the versatility and mastery Duffey shows with his curve, I'd say his breaker is better than Kershaw's or Grenke's, both of whom use the curve as an alternate to a blazing fastball, where Duffey uses it as his foundation pitch that everything else depends on. If the two Cy Young winners don't have a feel for their curve, they can get by with other stuff for awhile. It's hard to imagine Duffey not controlling his curve, except his very first appearance against Toronto, where he simply forgot how to pitch.