Nick Piecoro

English focused on pitching until he was a college sophomore. Now, he is making up ground quickly, both at the plate and in the field.

Adding a third pitch and watching his weight helped Frias become the top pitcher in the Northwest League.

Varsho rode a huge second half to the top of the Southern League leaderboard—and the precipice of the big leagues.

Ranking the D-backs’ top 30 MLB prospects midway through 2019, including rising, falling, injured and graduated players.

The 21-year-old shortstop had shown impressive power and speed, but a pull-heavy hitting approach cut into his overall productivity.

An injury in college changed the way Smith pitched, forcing him to locate pitches and develop his secondary stuff.

Drafted out of high school last year, Kelly earned an assignment to low Class A Kane County with his performance and high maturity level.

The D-backs’ 14th-round pick in 2018, Green has a 1.62 ERA through his first 30 professional appearances, including five starts in 2019.

The precocious young outfielder is making a concerted effort to improve his contact rate. From there he will implement other changes, as necessary.

The athletic outfielder simplified his hitting approach and found success late in the California League season and postseason.

After a rough debut, Yoan Lopez could have folded. Instead, the righthander rebounded and hinted at his upside.

The relief prospect incorporated his lower half more effectively, which reduced stress on his arm, improved his recovery time and improved his effective velocity.

A 20th-round pick, Miroglio raced to Double-A in his full-season debut, outpacing players drafted ahead of him.

The supplemental first-rounder played well in his pro debut but found a way to get even better by tweaking his swing.

While the D-backs failed to sign their first-round pick this year, they secured a talented high school shortstop anyway in the 11th round.

The 20-year-old Bahamian shortstop shows easy power, with more in store if he can improve his hitting approach.

The 18-year-old Dominican shortstop has shined at three levels this season in his U.S. debut.

A look at the D-Backs updated Top 10 midseason prospects as they battle for a National League playoff spot.

Quick feet and a quick release mark the athletic Varsho as the D-backs’ potential catcher of the future.

Headlined by a high-spin fastball, Vargas has shown a repertoire that could produce results in a big league rotation.