The annual ranking of baseball's Top 100 Prospects is assembled by MLBPipeline.com Draft and prospect experts Jonathan Mayo, Jim Callis and Mike Rosenbaum, who compile input from industry sources, including scouts and scouting directors. It is based on analysis of players' skill sets, upsides, proximity to the Majors and potential immediate impact to their teams. Only players with rookie status entering the 2016 season are eligible for the list. The rankings follow the guidelines laid out by the Collective Bargaining Agreement, in terms of who falls under the international pool money rules: Players who were at least 23 years old when they signed and played in leagues deemed to be professional (Japan, Korea, Taiwan, Cuba) are not eligible.
Regarded the 78th-best prospect midway through the 2015 campaign, Shipley elevated his stock with a strong second half.
The right-hander went 9-11 with a 3.50 ERA in 28 games (27 starts) for Double-A Mobile last season, but in the second half he was dominant.
Shipley posted a 2.66 ERA after the All-Star break and gave up two earned runs or fewer in eight of his final nine appearances.
Conversely, Bradley's stock has dipped a bit since last season -- he was the No. 39 prospect midway through 2015.
Bradley made his first three starts of 2015 with the D-backs and gave up just three runs over 18 2/3 innings. However, on April 28, Bradley took a line drive to the face.
Bradley struggled in his return to the rotation, but finished the year in the Minors where he appeared to get back on track. Pitching in the Arizona Rookie League, Class A Advanced and Triple-A, Bradley made six starts and posted a 2.76 ERA.
Over his final six appearances, Bradley never gave up more than three runs in an outing and put together two scoreless starts.
The rest of the D-backs' Top 30 Prospects will be released in mid-February.
William Boor is a reporter for MLB.com. Follow him on Twitter at @wboor. This story was not subject to the approval of Major League Baseball or its clubs.