Nelson issued a walk in a scoreless inning as the opener in Sunday's win over the Phillies.

EDGE Analysis

Nelson got through a scoreless inning of work despite throwing just seven of 15 pitches for strikes. He lowered his ERA to 1.93 with a 19:3 K:BB through 18.2 innings this season. However, Sunday's outing snapped the 25-year-old's streak of 15 consecutive contests without issuing a walk.

Nelson will serve as the Diamondbacks' opening pitcher Sunday against the Phillies, Nick Piecoro of The Arizona Republic reports.

EDGE Analysis

By tapping the left-handed Nelson, Diamondbacks manager Torey Lovullo hopes to neutralize sluggers Kyle Schwarber and Bryce Harper, lefty hitters at the top of the Phillies' order. Nelson is not expected to go much more than an inning. Luke Weaver, who Arizona added to its taxi squad Saturday, is expected to pitch multiple innings following Nelson. The need for a fill-in starter was created when Humberto Castellanos (elbow) was added to the 15-day injured list.

Nelson was activated off the COVID-19 injured list Saturday.

EDGE Analysis

Nelson spent the last 10 days on the injured list but is ready to return without a rehab assignment. His return will be a boost to the Diamondbacks' bullpen, as he owns an excellent 1.23 ERA over 14.2 innings and has struck out 16 batters while walking just two.

The Diamondbacks placed Nelson on the injured list Wednesday without a designation, implying that he's been added to the COVID-19-related IL.

EDGE Analysis

Outfielder/designated hitter Cooper Hummel was also placed on the COVID-19-related IL, with Arizona calling up infielder Yonny Hernandez and reliever Jacob Webb to take their spots on the active roster. Nelson has been a standout performer in the Arizona bullpen this season, gathering a win and five holds while posting a 1.23 ERA, 0.75 WHIP and 16:2 K:BB across 14.2 innings.

Nelson (1-0) picked up a relief win Monday, allowing one hit and striking out two over a scoreless inning in a 4-3 victory over Miami.

EDGE Analysis

Nelson logged three outs across the sixth and seventh innings and was the pitcher of record when Ketel Marte launched a game-deciding home run. The scoreless outing was Nelson's 11th in 12 appearances and lowered his ERA to 1.50. The left-hander has allowed two runs on six hits and two walks while striking out 14 over 12 innings.

Nelson ditched his cutter in favor of exclusively throwing a fastball-slider mix, Theo Mackie of the Arizona Republic reports.

EDGE Analysis

Nelson added the cutter during the offseason leading up to 2021 in hopes of showing a third viable pitch, but the results were not good. The left-hander was tagged for a 9.31 ERA across 9.2 innings for Cleveland before being demoted. His performance in the minors was equally discouraging, so the Guardians eventually cut him loose. The Diamondbacks, whose analytics staff was intrigued by the fastball-slider mix, quickly claimed him off waivers. After getting him to scrap the cutter, the 25-year-old pitcher has been a gem out of the bullpen since getting the call from Triple-A Reno. Across 7.2 innings this season, Nelson has not allowed a run on three hits and two walks while striking out eight.

Nelson allowed two hits over a scoreless 1.1 innings in Saturday's 5-2 win over the Mets.

EDGE Analysis

Nelson needed one pitch to get out of a two-on jam created by Noe Ramirez in the sixth inning then had an eventful seventh. He worked around two singles, a wild pitch and an error during the inning that also featured Robinson Cano being ruled out when a batted ball struck him -- the second time a runner was hit by a batted ball during the game. Nelson has allowed three hits and two walks while striking out seven over 6.2 scoreless innings since being called up from Triple-A Reno.

Nelson was recalled by the Diamondbacks on Sunday.

EDGE Analysis

Nelson was claimed off waivers by Arizona during the offseason, and he was set to begin the season at Triple-A Reno. However, he'll now have the chance to improve on his past big-league opportunities, during which he's posted a 12.19 ERA across 10.1 innings. Nelson will be limited to low-leverage outings.

Nelson was claimed off waivers by the Diamondbacks on Wednesday.

EDGE Analysis

Nelson was designated for assignment by the Guardians on Friday after he posted a 9.31 ERA and 1.86 WHIP in 9.2 innings across 10 major-league appearances in 2021. Although he spent most of the year in the minors, he should be in the mix for a major-league roster spot in Arizona during the 2022 campaign.

Nelson was designated for assignment by the Guardians on Friday.

EDGE Analysis

Nelson posted a 9.31 ERA and 1.86 WHIP in 9.2 innings across 10 appearances in the majors last year. He spent the second half of the season at Triple-A Columbus and will now be cast off the 40-man roster.