The Arizona Diamondbacks have sent pitcher Blake Walston back down to Triple-A Reno. Walston made his debut on Monday versus the Los Angeles Dodgers. Walston went 3 2/3 out of the bullpen for the Diamondbacks and was wild with four walks and two runs allowed. Walston's trip was brief, but it is likely that he will be back with the Diamondbacks when they need more pitching depth or an injury occurs. Replacing Walston on the active roster will be pitcher Matt Bowman. Bowman was acquired from the Minnesota Twins for cash considerations on Thursday. Both Walston and Bowman can remain on the waiver wire in all formats.

Boston Red Sox starting pitcher Nick Pivetta (elbow) got roughed up in his first rehab start for Triple-A Worcester. Pivetta went three innings and allowed three hits, four runs, four walks and recorded five strikeouts. He also threw 62 pitches in the contest, as he builds up for his return to the Red Sox rotation. Pivetta has been sidelined since April with a right elbow flexor strain, but was pitching very well in his first two starts of the season with one run allowed and 13 strikeouts over his first two starts. Pivetta is inching closer to his return and that would mean that Cooper Criswell or Chase Anderson will be replaced in the rotation. Pivetta may need a start or two to shake off the rust, but he is worth rostering in most formats with his ability to rack up strikeouts being a big reason why.

Chicago Cubs starting pitcher Kyle Hendricks (back) looked healthy in a rehab start for Double-A Tennessee on Thursday. The veteran tossed five innings and allowed six hits, two runs, no walks and struck out seven on the evening, Hendricks has been shelved since late April with a minor lower back injury and it has yet to be determined if this will be his one and only rehab start or if he will make another one. When on the mound for the Cubs this season, Hendricks has gotten rocked with 28 runs allowed in 21 innings. The once consistent starter has fallen on hard times and can be left on the waiver wire in all formats when he is activated.

Seattle Mariners outfield prospect Lazaro Montes launched his fourth and fifth home runs of the season in Thursday's victory. This big performance brings Montes to an excellent .291/.404/.535 stat line with 27 RBI at Single-A. The 19-year-old is quickly approaching last season's home run count of seven that he posted at the same level. Montes is the fourth-best prospect in the Seattle system on MLB Pipeline but should not be expected to reach the major leagues for several years. However, dynasty managers may want to consider stashing him if he reaches High-A or even Double-A by the end of the summer, as he is flashing stellar power potential at just 19 years old and could grow into a top prospect in baseball.

Chicago White Sox shortstop prospect Colson Montgomery went 2-for-3 at the plate and launched his fourth home run of the campaign on Thursday. Through his first 26 games at the Triple-A level, the 22-year-old is riding a .228/.345/.396 slash line with three stolen bases. Montgomery spent the majority of the last season with Double-A, and it is promising to see the budding shortstop already match his home run total of the four he posted there last year. The top prospect in the Chicago system should push for a late-season promotion. He should be rostered in all dynasty and keeper leagues and could even be worth stashing in deeper redraft formats fairly soon if he continues to showcase his power potential.