San Diego Padres 2026 Top Prospects: Jagger Haynes (No. 6)

Padres Mission's countdown of the top 20 San Diego Padres prospects, as voted on by our staff writers, continues with deeper profiles on the top 10 entering the 2026 season.

Check out prior entries in the ranking here:

• No. 7: Humberto Cruz
• No. 8: Ty Harvey
• No. 9: Ryan Wideman
• No. 10: Kale Fountain
• Nos. 11-15
• Nos. 16-20

No. 6: Jagger Haynes (San Antonio Missions)

Coming out of a small North Carolina high school in the abbreviated 2020 draft, the Padres selected left-handed starter Jagger Haynes with their final pick, taking him in the fifth round. Due to trades, Haynes is the lone member of that class still with the Friars. Haynes comes from the same remote area of North Carolina where the Padres found MacKenzie Gore.

Now 23, Haynes' pro career got off to a slow start after he had Tommy John surgery, so his debut didn't come until the start of the 2023 season at Low-A Lake Elsinore. That season was slowed by blister and shoulder issues, but he did put up a 3.91 ERA in 11 starts, although he only logged 25 1/3 innings.

But he came back strong in 2024. At High-A Fort Wayne, Haynes was healthy enough to appear in 23 games, all but one a start. While the numbers left a little to be desired (4.64 ERA, 1.41 WHIP), the fact he was able to go 110⅔ innings was definitely a positive. He walked 5.4 per nine innings and struck out 9.3. Haynes followed that up with a better 2025 at Double-A San Antonio. In 26 appearances (25 starts), Haynes had a 4.11 ERA and 1.408 WHIP, walking 5.4 per nine innings and striking out 8.8 in 103 innings.

The velocity was back for Haynes in 2025, but he still only sat at 91-94 with his four-seam fastball after the pitch was listed at 94 mph coming out of high school. He also throws a sinker, a changeup, and a slider, the latter appearing to be a very effective pitch. The sinker is a pitch that he has developed since turning pro.

Walks are definitely an issue, something that he will need to improve upon to make his way to the majors. His career hits per nine (7.3) is solid, but with his softer stuff, limiting hard contact would also increase his chances.

Haynes should be moved up to Triple-A El Paso this season, even though he might face a better quality of competition by returning to San Antonio. That is just the natural progression, especially in the aggressive-promotion Padres system, that makes sense. Not that this would necessarily be an aggressive promotion — Haynes is facing a big season relative to service time. He was left unprotected this offseason for the Rule 5 Draft. Even a decent year would force the Friars' hand to put him on the 40-man roster next offseason, leading to the hope that he'll potentially make his MLB debut in 2027. If his numbers don't show progress as a starter, the Padres may experiment with how the stuff plays in a relief role.

Interested in learning more about the San Diego Padres' top prospects? Check out our comprehensive top prospects list that includes up-to-date stats, articles and videos about every prospect, scouting reports, and more!