Tim Williams

The slugging first baseman worked on his pitch selection and defensive proficiency during the lost minor league season.

A change to his hitting setup this spring allowed Ke’Bryan Hayes to access his power. Now he looks like a franchise building block.

The 2019 first-rounder has focused on improving his arsenal, including maintaining his fastball velocity.

The righthander has revamped his arsenal and delivery with the help of two former big leaguers.

The Pirates helped Tucker chase less and hit the ball in the air more often last season, but it took time for the adjustments to stick.

The 24-year-old has showcased speed and on-base skills, but power development is the next frontier as he readies for Triple-A.

Sitting out the 2019 season after having Tommy John surgery allowed the 22-year-old righthander to sharpen and refine his repertoire.

The Pirates moved Ponce back to the rotation after acquiring him from the Brewers this summer. Now he can make use of all four of his pitches.

The fact that Pirates prospects tended to improve dramatically with new organizations did not go unnoticed by ownership.

Signed as a nondrafted free agent, Mears rocketed to Double-A as a reliever.

Martin made several changes in 2019 that helped him maximize his power. Still he knows he has work to do.

The 6-foot-6 shortstop hit his way to Double-A, all while working hard to improve his throwing accuracy.

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

The Pirates regularly develop prep righties into high-profile pitching prospects; they think Priester will be no exception.

A more disciplined hitting approach had Castro chasing less and barreling more as he repeats low Class A.

The sixth-round success story saw encouraging results from adding a pitch to complement his two-seam fastball.

Kramer took his lumps as a September callup, but that focused him on what he needs to improve at Triple-A this year.

The 25-year-old righthander should factor in Pittsburgh this year after tightening his slider and learning to vary the location and velocity of his fastball.

A season-ending injury in 2016 set Hayes’ offseason training regimen back, but he is now beginning to catch up—and so is his power.