Here, we point out that the goal of a changeup is usually to fool the batter by presenting a speed different from that of the fastball. Greinke does not do that. Just over a month ago, the Houston Astros pulled off the biggest move of the season: In a deal reported minutes after the trade deadline had passed, the Astros acquired Cy Young winner Zack Greinke from the Diamondbacks to form baseball’s best rotation alongside Justin Verlander and Gerrit Cole, the two likeliest Cy Young candidates.Greinke, a future Hall of Famer, has been stellar this season — a 2.99 ERA and a sub-1 WHIP. According to FiveThirtyEight’s pitcher ratings, he would be the top pitcher on two-thirds of teams and the No. 3 on just three — and that’s the one he’s on. The move already has paid dividends for the ‘Stros, who are 5-2 in Greinke’s starts and have baseball’s best run differential since the trade — by nearly 50 runs.Now six weeks into team No. 6 (remember when he was traded to the Angels for the 2012 stretch run?), Greinke continues to adapt. At 35 years old, it’s anyone’s guess how long he can keep up this performance, but he’s signed through 2021 and should contribute through then. And because of the way he’s dealt with his decreasing velocity by relying on command and movement, he should be set up well for continued long-term success.According to Statcast, Greinke throws eight pitches: four-seam fastball, changeup, slider, curve, sinker (or two-seam fastball), split finger, cutter and eephus. (We’ll get back to that last one.) Only Yu Darvish has as many listed on his Statcast page, with the same eight (though the classifications may hide some of Darvish’s arsenal). Anibal Sanchez, Rich Hill and Odrisamer Despaigne are the only pitchers with seven.But it’s not just the variety of pitches that makes Greinke special. It’s how he throws them.Consider his changeup. Greinke throws his offspeed on 21.9 percent of pitches — a fairly steady increase from 7.9 percent back in 2008. Yet as his fastball has lost velocity, from once hitting more than 100 miles per hour in 2010 to averaging below 90 in 2019, his changeup has gotten faster. Instead, Greinke uses a power changeup with devastating late movement. Only Edubray Ramos has a smaller average speed difference. Greinke’s pitch has surpassed his slider, which used to be considered his best pitch, as the second option. Along with this, Greinke’s cutter, a staple of his arsenal in 2012 and 2013, has all but disappeared.Then there’s the curveball, a slow sweeping pitch. Greinke’s curveball is the second-slowest among qualified starters, behind the Nationals’ Patrick Corbin, at just over 70 miles per hour.This is where the eephus comes in. Greinke’s curve can be thrown so slow that Statcast registers it as the arcing pitch. But it’s not clear whether it’s a different pitch or just a curveball thrown slower. Nobody is throwing a true eephus, though six pitchers are credited with the pitch this year; only Greinke has one under 60 miles per hour. But even if you consider his eephus and his curveball as the same pitch, Greinke would still be tied with Sanchez and Darvish for the lead with seven different pitches.MLB pitchers have struck out 16 hitters on sub-67 mph pitches this year. Greinke owns eight of those (and four of the rest are from position players) with his slow curve that can make batters look silly.Video Playerhttps://fivethirtyeight.com/wp-content/uploads/2019/09/d20e23b5-749c-4869-9845-d5b61e1ee064.mp400:0000:0000:14Use Up/Down Arrow keys to increase or decrease volume.The newest one is the split-finger, which he threw in April for the first time since pitch tracking began in 2008. He’s thrown five so far in 2019, including three to Jacob DeGrom in the same at bat. If he’s experimenting with it now, there’s a chance it becomes a regular part of his arsenal in the future, especially with the Astros’ penchant for getting the most out of pitch selection.But beyond his wide repertoire of pitches, Greinke’s pitching style is one of a kind. He throws most pitches low but gets strikes. Even though he throws fewer pitches in the strike zone than average, he almost never falls behind. And his .198 wOBA allowed on pitches out of the zone is second in MLB, also behind Corbin.Greinke has faced just 11 3-0 counts this year and had thrown a fastball every time, almost always on the edge, until he gave Christian Yelich a perfect changeup last week. None of the 20 other pitchers with as many pitches this year has seen fewer than 15 such counts. In the month of July, Greinke threw 479 pitches and none was in a 3-0 count. He threw eight pitches with a 2-0 count — seven were in the strike zone and the other was fouled off. He’ll throw in the strike zone when he falls behind; that just doesn’t happen very often. And even when he does, batters can’t take advantage — they’re just 2-16 on 2-0 counts this year despite seeing 65 percent of pitches in the strike zone.When he’s ahead, it’s a different story. That’s when the sub-70 curveball becomes devastating. Ahead in the count, Greinke throws just 27 percent of pitches in the strike zone; the league average is 38 percent. And 76 percent of his strikeouts have been on pitches out of the zone, well higher than the league average of 56 percent. And his plan of attack is to go low. On 1-2 counts, specifically, Greinke throws in either the lower third or below the strike zone more often than any other pitcher.Greinke is truly a unique pitcher. His fastball and offspeed have nearly the same velocity, but his curveball is one of the slowest. He throws outside of the strike zone but never falls behind, and batters can’t seem to figure out any of his pitches.Through his impressive career, the one thing Greinke lacks is a ring. He has 11 postseason appearances, but his biggest impact was probably his lone start in the 2014 NLDS (in which he scored more runs than he allowed in seven innings). He makes the top 10 list of career games started without a World Series appearance. But if he earns a huge postseason moment, he could move from likely Hall of Famer to potentially first ballot. Perhaps he’ll have that chance in Houston this October.Check out our latest MLB predictions.