Zac Thornton's Impressive Opening Act Raises Questions About His Standing In Loaded Mets Rookie Class

The New York Mets will be one of the most active teams ahead of the trade deadline, just not in the exact way they envisioned before the start of the season. They are expected to be among the few sellers in baseball, looking to offload most of their veterans before August 3.

They are expected to keep a short list of players off limits, though. Juan Soto, A.J. Ewing, Carson Benge, Nolan McLean, Francisco Alvarez, and Juan Soto are some of them. Is it time to add rookie left-hander Zac Thornton to that exclusive list?

After tossing six shutout innings against the Milwaukee Brewers earlier this week, the southpaw now boasts a 1.93 ERA in four starts at the MLB level this season. Is he the newest Mets’ pitching star?

Understanding What the Mets Have In Rookie Zac Thornton

Thornton, a fifth-round pick out of Grand Canyon University in Phoenix back in 2023, averages 92 mph with his four-seam fastball. He also boasts a mediocre 19.5 percent strikeout rate in the extremely small sample of 23 1/3 innings.

To make matters worse, Thornton had as many whiffs, six, as he allowed hard-hit balls in that start against the Brewers. Overall, his 21.3 percent whiff rate would rank him in the bottom quarter of the league if he qualified.

The point, if you haven’t caught it by now, is clear: Thornton is no ace. He doesn’t have McLean’s ceiling, in case you were asking. That, however, doesn’t mean he can’t be a quality piece in a major-league rotation, which takes us to our point: Thornton is well worth keeping around.

We are talking about a 24-year-old left-hander with six full seasons of cheap team control who has shown an ability to throw strikes in his first four MLB outings. He is walking just 2.31 batters per nine frames in the limited sample, so even though he is just striking out 6.56 hitters per nine, he has proven effective at keeping traffic off the basepaths.

Before being called up to the majors, he had a 4.30 ERA and a 5.46 FIP in 37 2/3 Triple-A innings. He was a completely different pitcher, with 4.30 walks per nine and 9.08 strikeouts per nine. What could have happened is that the Triple-A coaching staff might have given him different indications than the Mets’ staff did once he was called up. Or, you know, he is still trying to find his identity. In any case, we have seen enough to be intrigued.

Thornton uses six pitches: a cutter (41.4 percent), a four-seamer (27.4 percent), a sweeper (14.6 percent), a sinker (11.8 percent), a changeup (3.1 percent), and a curveball (1.6 percent). The sweeper has earned him a solid 34.8 percent whiff rate so far.

The cutter is the foundation of his repertoire. He generally targets the low-and-in corner against righties, which would be the low-and-away part of the zone for lefties, and generally does a good job locating the pitch:

Thornton is a pitcher who needs to show excellent command to thrive. That has mostly been the case so far in his first four starts, but MLB hitters will make him pay when he doesn’t because he doesn’t really have overpowering stuff. It’s what caps his ceiling.

Here’s what MLB Pipeline has to say about him: “His fastball velocity only sits 89-92 mph (occasionally popping 95), but with some deception and ride on the heater, he can still put it past bats at the top rail. His 83-86 mph slider remains his best pitch. It’s a two-plane breaker that he can spot exceptionally well to the gloveside, and he isn’t afraid of bringing it in on righties. His upper-80s cutter gives him another chase-heavy pitch. His 82-84 mph changeup and slow mid-70s curveball occasionally get folded in but find the zone much less often than his other offerings.”

The slider they are referring to is basically what Baseball Savant calls his sweeper. It helps that he can use it against both righties and lefties and that he has excellent command of it.

All things considered, Thornton’s deep repertoire, solid control, and craftiness on the mound, not to mention a ‘bulldog mentality’ as described by MLB Pipeline, give him a chance to be a solid back-end starter for the Mets. As long as fans don’t expect him to be an ace, he can be a valuable piece of the next competitive team this organization fields.

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