Koch cleared waivers and was outrighted to Triple-A Reno on Friday.
No team wanted to claim Koch after he posted a 9.15 ERA in 20.2 innings of relief to start the season. With a career 4.88 ERA and a 13.1 percent strikeout rate, there's little reason to believe he'll be a significant big-league asset any time soon.
Koch was designated for assignment by the Diamondbacks on Sunday.
Koch was quite poor in 20.2 innings of relief, posting a 9.15 ERA while walking just 9.4 percent of opposing batters. With a career 4.88 ERA in 125.1 innings and a considerably worse 5.99 FIP, it doesn't appear particularly likely that he'll be claimed off waivers. Jon Duplantier was called up to take his spot in the bullpen.
Koch allowed two runs on two hits, two walks and two hit batsmen while striking out one over 4.1 innings of relief in Friday's 5-1 loss to the Cubs.
Starter Merrill Kelly had issues with his command throughout his 3.2 innings, walking seven and departing after 109 pitches. That's the ideal situation for Koch, who lost out on a bid to be a starter during spring training. This was the second time he's thrown four-plus innings in relief. It's been a rocky transition to the bullpen for Koch, who has given up 17 runs and six home runs over 13.1 innings.
Koch will not be part of the Diamondbacks' rotation to begin the season, Zach Buchanan of The Athletic reports.
Koch posted good numbers this spring, finishing with a 3.18 in 17 innings while recording a 13:3 K:BB. Merrill Kelly will be the fifth starter for now, but Koch could be the first one called on when the team needs a spot starter.
Koch gave up two runs on five hits while striking out six over five-plus innings Friday against the Dodgers.
Koch, who made 14 starts and five relief appearances in 2018, is widely expected to be part of the Diamondbacks' bullpen, Nick Piecoro of the Arizona Republic reports. The right-hander has posted a 3.18 ERA over 17 Cactus League innings. "I've been extremely impressed by what he's done," manager Torey Lovullo said. "You walk into camp and know you're competing, you're told you have to earn the spot, and when you do things like this it really stands out." Koch is out of options, so the Diamondbacks risk losing him if they want to send him down.
Koch (arm) will start Sunday's split-squad game against the Rockies in Mexico.
Koch was scratched from his first spring start Feb. 22 due to right arm fatigue but has since made two Cactus League appearances for the Diamondbacks. The 28-year-old should be ready to go for Opening Day as he attempts to earn a spot in Arizona's starting rotation.
Koch was scratched from his upcoming spring debut Friday due to arm fatigue.
It's possible that this is just a minor spring maintenance issue, though it's not a great sign for a pitcher to fatigued before game action even starts. Nick Green will start the team's Cactus League opener in his place.
Koch allowed one run on five hits and three walks while striking out two over 4.1 innings in Tuesday's win over the Dodgers. He did not factor into the decision.
Koch was called on for a spot start and was only stretched out enough to throw 68 pitches (42 strikes). The righty was serviceable in that role Tuesday, lowering his ERA to 4.15, but if he makes another appearance over the final week of the season, it'll likely be out of the bullpen.
Koch will start Tuesday against the Dodgers, Steve Gilbert of MLB.com reports.
Koch has appeared in 18 games (13 starts) for the Diamondbacks this season, posting a 4.26 ERA with 48 strikeouts over 82.1 frames. Although he was moved to the bullpen Tuesday, he'll get one more chance to start before the year ends.
Koch struck out seven over four scoreless innings out of the bullpen Tuesday in the Diamondbacks' 9-1 loss to the Cubs. He gave up three hits and issued no walks in the 51-pitch appearance.
Koch's performance in long relief was one of the few silver linings on the day for the Diamondbacks, whose fading playoff hopes took another hit with the team dropping a fourth consecutive game. Though Matt Andriese received the starting nod in place of the injured Clay Buchholz (elbow), Koch could enter the rotation the next time the fifth spot comes up. Koch was the better performer of the two pitchers by a significant margin, as Andriese was tagged for five runs while lasting only two innings.
Koch will head back to the bullpen with Matt Andriese set to replace the injured Clay Buchholz (elbow) in the rotation Tuesday against the Cubs, Steve Gilbert of MLB.com reports.
After Buchholz was shut down after experiencing elbow stiffness during a pregame bullpen session last Thursday in Colorado, Koch was pressed into a starting role on short notice. Considering the circumstances, Koch did well to eat three innings for the Diamondbacks, though he was tagged for four runs on eight hits and two walks. With Koch having posted a 4.83 ERA and a measly 4.5 K/9 over 13 starts with the big club this season, the Diamondbacks weren't eager to look his way again for starts over the final two weeks, so they'll instead give Andriese a chance to prove his worth in the rotation.
Koch (5-5) threw three innings and took the loss Thursday, yielding four runs on eight hits and two walks in the 10-3 defeat against Colorado. He struck out two and gave up two home runs.
Koch was called on to spot start after Clay Buchholz (elbow) became a late scratch. Nolan Arenado took him deep in the first inning and Trevor Story hit a two-run blast off him in the third. The 27-year-old will likely stick around in the bullpen down the stretch.
Koch was recalled from Triple-A Reno on Saturday.
The right-hander enjoyed a sizzling start to the 2018 season, spinning a 2.59 ERA in his first five starts, but Koch soon fell apart afterward with a 5.80 ERA in the following nine outings and lost his rotation spot in late June. He'll return to the majors as a depth piece in the bullpen with potential to step in for an emergency start.
Koch was optioned to Triple-A Reno on Tuesday.
Koch was called up just before the break and tossed a pair of scoreless innings, lowering his season ERA to 4.28. He'll make way for the return of Clay Buchholz (oblique), who gets the start Tuesday against the Cubs.
Koch was recalled from Triple-A Reno on Thursday, Zach Buchanan of The Athletic reports.
Koch will likely be utilized out of the club's bullpen over the next few days, though he could wind up re-joining Arizona's rotation after the All-Star break should Shelby Miller (elbow) require an extended stay on the disabled list. Across 13 appearances (12 starts) for the Diamondbacks this year, Koch has logged a 4.40 ERA and 1.20 WHIP with just 38 strikeouts in 71.2 innings.
Koch was optioned to Triple-A Reno following Tuesday's start.
Koch will return to the minors after spending the past two months in the Diamondbacks' rotation. Over that span, he logged a 4.40 ERA and 1.20 WHIP with a 38:17 K:BB across 71.2 innings. Though his raw numbers were solid at the onset of his promotion, the right-hander has been been streaky throughout his time with Arizona, including an outing against the Angles on Tuesday during which he allowed five earned runs off seven hits, two walks and two hit batsman in 5.2 innings. Koch will receive regular starts in Reno moving forward. In a corresponding move, Jake Barrett was recalled.
Diamondbacks manager Torey Lovullo said after Tuesday's 5-4 loss to the Angels that it's "yet to be determined" if Koch would make his next scheduled turn through the rotation Monday against the Marlins, Steve Gilbert of MLB.com reports. "We're going to huddle up and have some conversations and figure out what the next course of action [is]," Lovullo said, regarding the Diamondbacks' rotation plans for the upcoming week.
Expectations were low for Koch when he was promoted from Triple-A Reno in mid-April to replace Taijuan Walker (elbow) in the rotation, but the 27-year-old surprisingly proved to be a reliable back-end starter. He came out of the gates hot with a 3-0 record, 2.59 ERA and 1.05 WHIP through his first five starts, but his 4.9 K/9 and low groundball rate suggested a reckoning was coming. Koch has since delivered a 6.10 ERA in his last seven starts while surrendering 11 home runs, including two in the loss to the Angels. With Shelby Miller (elbow) coming off a strong four-game rehab assignment and checking out fine after a 40-pitch bullpen session Tuesday, it appears he may now be the top candidate to start the series opener versus Miami. If that's the case, Koch would shift to a long-relief role or head back to Reno to continue making regular starts.
Koch (5-4) allowed five runs on seven hits in a loss to the Angels on Tuesday, issuing two walks and failing to record a strikeout in 5.2 innings.
Koch surrendered a pair of solo home runs to Ian Kinsler and Kole Calhoun, but the major damage came on a bases-loaded single by Mike Trout that plated three runs. In three of his last five starts, Koch has allowed five earned runs, but the other two outings were quality starts. Overall, the 27-year-old has a 4.40 ERA and 1.20 WHIP with a 38:17 K:BB in 71.2 innings. As Shelby Miller and Robbie Ray near a return to the Arizona rotation, Koch may be on the brink of losing his starting role.
Koch (5-3) allowed two earned runs on three hits and one walk while striking out five across six innings to earn the win Thursday against the Mets.
Koch overcame two solo home runs by allowing only two other baserunners across his six innings of work. It was a nice bounceback effort after he was knocked around for five earned runs in his last start, which came at Coors Field. His 11 starts have had plenty of ups and downs as he has allowed five or more earned runs on three occasions, but three or fewer in the rest. Still, his time in the rotation may be limited with both Robbie Ray (oblique) and Shelby Miller (elbow) in the midst of rehab stints.
Koch allowed seven runs (five earned) on eight hits and a walk while striking out two across five innings Saturday against the Rockies. He did not factor into the decision.
Koch struggled with Coors Field as he surrendered three home runs, the first time he has allowed multiple home runs in a start since May 16. The one positive to take from his effort was that he wasn't handed a loss thanks to the run support he received from the Diamondbacks' offense. With both Shelby Miller and Robbie Ray nearing a return to the rotation, Koch may have a limited number of starts remaining in his future.
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