Article: Promising Red Sox Pitching Prospects: Juan Valera

[Nick John]

In the first of three entries on promising pitching prospects, we tackle Juan Valera, who is currently running a 3.52 ERA in High-A Greenville.

It's been a while since the Red Sox were known for their pitching development successes. You could argue that the last dominant starter they drafted and developed was Jon Lester. That looks to have changed since Craig Breslow’s hiring and overhaul of the pitching infrastructure. Although the top of the rotation is still populated with trade and free agent acquisitions, many pitching prospects are showing their growth early on this season.

When Breslow was hired, one of his key points was overhauling the team’s pitching development, not just at the major league level, but also throughout the entire organization. His first act was hiring Andrew Bailey as the pitching coach to work on a new philosophy with the major league staff, but he didn’t stop there. Breslow continued to improve the infrastructure, hiring Driveline Baseball co-founder Kyle Boddy as an advisor and bringing in Justin Willard, who had formerly been the Minnesota Twins’ pitching coordinator, as director of pitching. The additions seem to be working out. Minor league pitching is improving, and pitchers are beginning to gain attention. We'll highlight three such pitchers in the coming days.

The youngest and perhaps the most exciting prospect is Juan Valera, an 18-year-old who signed as an international free agent back in 2023. Valera, who opened the 2025 season with Greenville after pitching 23 innings in Salem last season, is likely to make a few Top 100 Prospects lists if he continues to throw like he has to open the season. Appearing in two games so far, Valera has thrown 7 2/3 innings, striking out nine and hitting 100 mph. His control may need work, as the young flamethrower having walked five batters already, but it’s hard not to be excited for his development.

Valera uses a simplified wind-up that's similar to throwing from the stretch, utilizing a three-quarters arm slot. He currently throws four pitches: a fastball, slider, sweeper, and changeup. The fastball is currently his best pitch, sitting 96-98 mph and topping out at 100 mph. It shows bat-missing potential up in the zone. If Valera's command and control can improve, the pitch could become a plus-plus offering for the young right-hander.

Valera's slider is his second-best offering. It takes on a 10-to-4 break and sits around 89-92 mph. Valera looks for chases below the zone, and it appears to be an average to above-average pitch.

The changeup is an interesting pitch, sitting 91-94 mph, not a ton of separation from the fastball in terms of velocity. It’s been said that the shape can vary, sometimes looking closer to a two-seam fastball and sometimes looking closer to a typical changeup with fade and drop. The pitch itself has bat-missing ability, but Valera will need to work on it for it to reach the potential of an average to above-average pitch.

Finally, Valera's sweeper is the weakest of the four pitches, sitting around 86-88 mph with horizontal break but not much depth. He struggles to find consistency with it and because of that it’s currently viewed as a fringe-average pitch.

Valera dominated in his second start of the season, tossing four innings of one-hit baseball. The only hit was a home run in the fourth inning. Valera only needed 60 pitches to make it through the start, generating five whiffs to go with his two strikeouts. The whiffs are the most interesting factor, as Valera was coming off a High-A debut in which he generated 11 whiffs. In that start, Valera demonstrated more of his strikeout potential, mowing down seven batters in just 3 2/3 innings pitched. 

While not every pitching prospect will pan out, the Red Sox are giving themselves plenty of chances to develop pitchers for the major league roster. Many other prospects such as Luis Perales, David Sandlin and Connelly Early are generating buzz as they climb prospect lists, but there are many others who have impressed the organization with their stuff and development. So far, the overhaul of the team's pitching infrastructure is setting the Red Sox up nicely for the future.

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