Alex Verdugo

Alex VerdugoJennifer Stewart/Getty Images

Arizona Diamondbacks: RHP Jon Duplantier

The Diamondbacks acquired J.D. Martinez at the deadline last year without dealing any of their top-tier prospects, and they’ll likely take a similar approach with any trades they explore this summer.

Jon Duplantier is the system’s consensus top prospect after going 12-3 with a 1.39 ERA, 0.98 WHIP and 165 strikeouts in 136 innings between Single-A and High-A in his first full pro season.

It’s been more of the same this year from the 6’4″, 225-pound right-hander, who possesses four average-or-better offerings and good command. He’s 3-1 with a 2.52 ERA, 1.12 WHIP and 41 strikeouts in 35.2 innings over seven starts at Double-A.

The 24-year-old has a chance to be a key piece of the rotation as soon as next year, and it’s unlikely the D-backs will explore any trades significant enough to consider parting with him.

            

Colorado Rockies: RHP Peter Lambert

Brendan Rodgers is the top prospect in the Rockies system.

However, as Trevor Story is enjoying an All-Star-caliber season, DJ LeMahieu is a candidate to be re-signed and prospect Garrett Hampson knocking on the door, Rodgers could be considered expendable if the right opportunity presents itself.

Meanwhile, with the ongoing need for quality arms, a Peter Lambert swap might not be in the cards.

After all, as MLB.com wrote: “He looks like a future No. 3 starter and perhaps more if he can get stronger and add more velocity”

The 21-year-old is already pitching in Triple-A, and he’s gone 9-2 with a 2.28 ERA, 1.00 WHIP and a 77-to-12 strikeout-to-walk ratio in 98.2 innings.

          

Los Angeles Dodgers: OF Alex Verdugo

Last July, Jerry Crasnick of ESPN.com offered the following:

“The Dodgers have told potential trade partners they’re extremely hesitant to part with minor league outfielder Alex Verdugo and pitchers Walker Buehler and Yadier Alvarez. It might be a reach to classify those three prospects as ‘untouchable,’ but they’re the closest thing the Dodgers have to the hallowed ground occupied by Corey Seager, Cody Bellinger and Julio Urias in recent years.”

Buehler has since joined the starting staff, and Alvarez has seen his stock slide as a result of control problems, but nothing has changed on the Verdugo front.

The 22-year-old is still one of the best pure hitters in the minors, with a 60-grade hit tool that has helped him bat .350/.393/.513 at Triple-A this season.

An everyday spot in the Los Angeles outfield is waiting in the not-too-distant future.

         

San Francisco Giants: OF Heliot Ramos

The No. 19 overall pick in the 2017 draft, Heliot Ramos immediately became the top prospect in a thin Giants system.

With huge raw power and impressive athleticism, his upside is impossible to ignore.

A .348/.404/.645 line with 23 extra-base hits in 151 plate appearances in rookie ball further fueled the hype, and with the Giants headed for inevitable retooling in the near future, he looks like a building block.

There’s significant swing-and-miss to his game, and he might not see the majors until 2021 at the earliest, but there’s a good chance he’ll be worth the wait.

           

Unlikely to Trade ProspectsSD

The San Diego Padres have worked hard to build one of baseball’s deepest farm systems—a group that checked in at No. 3 in our most recent system rankings.

The future is bright, but they’re still a couple of years away from contending, so there’s no reason to think they’ll part with any of that well-earned prospect talent.

Instead, they’ll spend the deadline fielding calls on the bullpen trio of Brad Hand, Kirby Yates and Craig Stammen.

           

All stats courtesy of Baseball Reference and FanGraphs, unless otherwise noted.