The D-backs thinned out their roster Monday afternoon as four players -- including three of the club's top 11 prospects -- were optioned and another was reassigned to Minor League camp.
Right-handers Archie Bradley, the D-backs' No. 2 prospect according to MLBPipeline.com, and Tyler Wagner, the club's 10th-ranked prospect, were optioned to Triple-A Reno. Gabby Guerrero, the No. 11 prospect, was optioned to Double-A Mobile along with left-hander Keith Hessler.
Outfielder Zach Borenstein also was reassigned to Minor League camp.
Bradley, who excelled in his first three starts last season before a line drive struck him in the face during his fourth outing, threw two scoreless innings March 2 in his first Cactus League outing. However, he gave up 10 runs across his next three games, including six earned runs in 2 1/3 innings against the Cubs in his last start.

Wagner gave up five runs in his 10 Cactus League innings, while Guerrero hit .250 in 28 at-bats.
The D-backs have 41 players left in Major League Spring Training.