Walston is scheduled to start Tuesday's game against the Giants at Chase Field.

EDGE Analysis

After he was called up from Triple-A Reno on May 26, Walston made his first big-league start later that day against the Marlins, striking out four over 4.2 scoreless innings in a no-decision. Arizona had previously confirmed Walston for a start against the Mets this past weekend, but he was ultimately pushed back in the pitching schedule after the Diamondbacks elected to call up Slade Cecconi from Reno to slot into the rotation following Zac Gallen's (hamstring) placement on the 15-day injured list. Until one of Gallen, Merrill Kelly (shoulder) or Eduardo Rodriguez (shoulder) returns from the IL, the Diamondbacks should have back-end rotation spots available for both Walston and Cecconi.

Walston is slated to start Saturday's game against the Mets at Citi Field.

EDGE Analysis

Walston will stick around as the fifth member of Arizona's rotation after he blanked the Marlins over 4.2 innings while striking out four in his first MLB start Sunday. Though the 23-year-old southpaw came through with a passable showing in his first start, fantasy managers should tread carefully with Walston, who has struggled to keep his walks in check at nearly every rung of the minors. Though he issued just one free pass against Miami, Walston walked four batters in his MLB debut May 1, when he tossed 3.2 innings of long relief against the Dodgers.

Walston did not factor into the decision in Sunday's loss to the Marlins. He tossed 4.2 scoreless innings while allowing just four hits and a walk and striking out four.

EDGE Analysis

Walston kept the Marlins' bats at bay and looked sharp in his first MLB start. He struck out a pair in the opening frame and was able to shut down the minimal scoring opportunities against him. Walston also pounded the zone, throwing 46 of his 65 pitches for strikes while garnering eight whiffs on the afternoon. Manager Torey Lovullo has not yet indicated whether Walston will get another start or not. If he does, the 23-year-old lefty would line up to face the Mets in New York this weekend. He now has nine strikeouts over his first 8.1 big league innings.

The Diamondbacks recalled Walston from Triple-A Reno ahead of his scheduled start Sunday against the Marlins in Arizona.

EDGE Analysis

Walston will be making his first MLB start, joining the rotation as a replacement for Slade Cecconi, who was optioned to Reno on Wednesday. A 22-year-old lefty, Walston made his major-league debut earlier this month in long relief before heading back to Reno, with whom he's produced a 4.54 ERA, 1.68 WHIP and 35:20 K:BB across 35.2 innings this season.

Diamondbacks manager Torey Lovullo confirmed that Walston will be called up from Triple-A Reno to start Sunday's game against the Marlins, Alex Weiner of ArizonaSports.com reports.

EDGE Analysis

He'll step into the rotation spot vacated by Slade Cecconi, who was optioned to Reno earlier in the week. Walston will be making his first MLB start and second MLB appearance Sunday after he was charged with two earned runs on three hits and four walks while striking out five over 3.2 innings in a long-relief appearance May 1 against the Dodgers. The 22-year-old lefty has been a member of the rotation for Reno for much of the season, logging a 4.54 ERA, 1.68 WHIP and 35:20 K:BB across 35.2 innings in the hitter-friendly Pacific Coast League.

Walston has joined the Diamondbacks' taxi squad and is expected to be called up from Triple-A Reno to start Sunday's game against the Marlins, Alex Weiner of ArizonaSports.com reports.

EDGE Analysis

The Diamondbacks haven't officially announced their pitching plans for Sunday, but Walston's presence in the clubhouse suggests that he'll be the choice to either start or work as a bulk reliever in the series finale versus Miami. The 22-year-old southpaw allowed two earned runs in 3.2 innings during his MLB debut May 1 against the Dodgers, and he has since posted a 4.20 ERA and 1.40 WHIP across three appearances upon being sent back down to Triple-A.

Walston was optioned to Triple-A Reno on Thursday.

EDGE Analysis

It was a brief stint for Walston, who was recalled by the Diamondbacks on Wednesday. He threw for 3.2 innings in Wednesday's loss to the Dodgers, allowing two runs on three hits and four walks while striking out five. The move corresponds with Arizona acquiring right-hander Matt Bowman from the Twins on Thursday, while Merrill Kelly (shoulder) was transferred to the 60-day IL.

Walston allowed two runs on three hits and four walks while striking out five over 3.2 innings in Wednesday's 8-0 loss to the Dodgers.

EDGE Analysis

Walston, a starter at Triple-A Reno who made his major-league debut Wednesday, was recalled earlier in the day following Tuesday's surprise bullpen effort that left the club in need of a fresh arm. His length was needed immediately, as starter Jordan Montgomery was ambushed by the Dodgers early. Walston navigated around a walk and two hits over three scoreless frames before running into trouble in the seventh inning. That's when the left-hander's shaky command -- three walks including one with the bases loaded -- caught up to him.

Walston was recalled from Triple-A Reno on Wednesday.

EDGE Analysis

Walston didn't make the cut for Arizona's Opening Day roster, but he will get a chance to play with the team after five years in the minors. The lefty pitcher has logged a 4.79 ERA and 1.88 WHIP over 20.2 innings in five games played with the Reno Aces so far this year. The 22-year-old will be making his major-league debut when he gets into a game and could work in long relief since he's pitched out of Reno's rotation.

The Diamondbacks optioned Walston to Triple-A Reno on Monday.

EDGE Analysis

Walston was dispatched to minor-league camp along with right-handers Slade Cecconi and Corbin Martin after all three pitchers fell short in their bids for spots on Arizona's Opening Day roster. Unlike Cecconi and Martin, Walston has yet to make his MLB debut, but the Diamondbacks saw enough potential in him to protect him from the Rule 5 Draft this winter and add him to their 40-man roster. The 22-year-old southpaw will be returning to Reno, where he posted a 4.52 ERA and 1.57 WHIP over 149.1 innings while pitching mostly in hitter-friendly venues in the Pacific Coast League.