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6/17/2014 2:24 A.M. ET

Williams collects three hits for Ospreys

Left fielder Justin Williams, the D-backs' No. 16 prospect, homered and collected three hits on Monday, helping rookie-level Missoula defeat Helena, 8-5, on Opening Day in the Pioneer League. The game was halted after eight innings due to rain.

Williams finished the game 3-for-4 with two runs, two RBIs, a walk and a stolen base. The home run was the second of his career.

Williams was just 17 when the D-backs selected him 52nd overall in the 2013 First-Year Player Draft. He played at three levels last summer after signing, reaching Class A South Bend at the end of the season. Across all levels, he played 51 games and hit .351/.397/.452 in his professional debut.

The D-backs have returned Williams to Missoula to start this season, and he was joined in the lineup on Monday night by two members of the club's 2014 Draft class. Center fielder Matt Railey and third baseman Tyler Humphries, the D-backs' third- and seventh-round picks, respectively, earlier this month, made their professional debuts.

Railey, who was ranked No. 64 on MLBPipeline.com's list of Top 200 Draft Prospects, led off for the Ospreys and went 0-for-3 with two walks and a run. Humphries hit cleanup and went 0-for-4 with a walk and a run.

Elbow strain sends Arroyo to DL for first time

PHOENIX -- For the first time in his 15-year career, Bronson Arroyo is headed to the disabled list.

The D-backs on Monday placed the 37-year-old right-hander on the 15-day DL with a strained UCL in his right elbow and called up outfielder Roger Kieschnick from Triple-A Reno to replace him on the roster.

"I've been beat up for a while," Arroyo said. "I've pitched the last six times pretty miserable out there, just trying to make it happen with a bit of guts and some mental ability.

"It's the first time I'm going to be shut down. We're going to take 10 days, not touch a ball, see how the arm reacts."

When asked if Tommy John surgery was a possibility, Arroyo said he didn't know.

"We're going to try to get all the swelling out, let it calm down completely and not irritate it for 10 days," he said. "Then probably give it another 10 to 15 to 20 days to try to fire it back up and see if it acts differently. And if it acts the same, then we're going to have to try something different."

Arroyo said there was inflammation in the elbow and that he should know if he's ready to pitch by the All-Star break, at the latest.

In the meantime, general manager Kevin Towers said that the team has somebody planned to take Arroyo's spot in the rotation and will make that announcement in the next day or two.

Arroyo has prided himself on his durability throughout his career.

"I looked at the numbers last night for the first time, and with my Minor League starts, I think I've thrown 546 times, and this is the first time I've had to miss one since 1995," Arroyo said. "I've been avoiding this day for two decades."

Arroyo picked up the win on Sunday after pitching five innings against the Dodgers. He said after the game that he didn't have nearly his best stuff, but despite that, he gave up only one run.

"I think the last three times he's went out there, he's been at about 50 percent," Towers said. "It's pretty amazing that he's posted the type of numbers [he has].

Said manager Kirk Gibson: "In the first inning, he barely could hit 80 mph. His elbow was really hurting him."

Arroyo has been one of the D-backs' most consistent starters this season. He is 7-4 with a 4.08 ERA -- the second lowest on the team among pitchers with more than 50 innings pitched.

"I would have hoped to make it to the end of my career without having to do it," Arroyo said. "But it's just not the way it is."

D-backs reflect on Gwynn's passing

PHOENIX -- The death of Hall of Famer Tony Gwynn on Monday resonated with several members of the D-backs organization who knew the former Padres right fielder.

General manager Kevin Towers met Gwynn, who had been battling cancer of the salivary gland since 2010, in 1983, when they were both in the San Diego organization.

"He's probably the guy that put the Padres on the map," Towers said. "The minute he started doing the special things on the field, winning batting titles, [he] really became 'Mr. Padre' at a very young age."

Towers said that as good a player Gwynn was, he had just as big of an impact off the field.

"Just an icon in San Diego in every sense of the word," he said. "I think more people are missing the person and the dad, the family man Tony Gwynn, probably, [more] than the player."

After Gwynn's playing days were over, he ran into a future member of the D-backs -- closer Addison Reed.

Gwynn spent 12 years as the head coach of the San Diego State University baseball team. Reed played for the Aztecs from 2008 to 2010.

"It was a shock," Reed said. "I knew he was kind of not doing too well, but I didn't think it was that bad. You'd never know if you talked to him, if you saw expressions on his face, he didn't show that he was hurt or anything.

"He wanted everybody to be happy and not worry, and that's exactly what he did. He left a great legacy behind, and he's going to be missed."

Reed said that although Gwynn was obviously better known for his hitting ability, that didn't keep him from offering his help.

"I wasn't a hitter in college, but that didn't stop him from trying to help me ... try to become the best person I could be, not only on the field but off the field," Reed said. "He taught me how to be a professional and just more than [a player]."

Collmenter, D-backs have World Cup fever

PHOENIX -- There's a new addition to Josh Collmenter's locker.

Hanging next to Collmenter's uniform is a large USA banner. Like millions of people around the world, he and other D-backs have caught World Cup fever.

The USA's tournament-opening 2-1 victory over Ghana was shown on several TVs in the clubhouse as well as on Chase Field's video screen in center field.

"It's fun, because we have an interesting dynamic," Collmenter said. "Oliver Perez, being from Mexico, was, of course, on the Mexican side. ... A lot of the other Latin guys that don't have a specific country -- because most of them are from Venezuela and Venezuela doesn't have a team in the Cup -- [are] kind of picking sides."

Miguel Montero is rooting for the Spanish team, which was routed, 5-1, by the Netherlands, much to the delight of infielder -- and Curacao native -- Didi Gregorius, who is rooting for the Dutch team.

But Gregorius didn't rub the blowout in Montero's face, he said, because you never know what the next game is going to bring.

Despite his banner and flag, Collmenter isn't a big soccer fan, but said that the World Cup can make people interested because of the national teams playing.

"[I'm a] big American fan more so than World Cup," he said.

"It's fun to have different cultures and different countries represented just to see whose side each person is on."

Adam Lichtenstein is an associate reporter for MLB.com. Teddy Cahill is a reporter for MLB.com. Follow him on Twitter at @tedcahill. This story was not subject to the approval of Major League Baseball or its clubs.