Top Prospects: Taijuan Walker, RHP, Mariners

HOUSTON -- Top Mariners pitching prospect Taijuan Walker arrived at Minute Maid Park on Thursday and took in the sights, even though he won't officially be added to the club's roster until just before his Major League debut on Friday.

"I'm pumped to be here," Walker said after playing catch with a football with teammates in the outfield prior to Thursday's series opener with the Astros.

The lanky right-hander couldn't stay with the team during Thursday's game since he won't be on the 25-man roster until the Mariners create an opening Friday. But Walker, who turned 21 two weeks ago, soaked in the stadium and visiting clubhouse and got an early opportunity to picture what it's going to feel like for his first big-league start.

"I couldn't help but smile," Walker said of his first steps out onto the Minute Maid turf. "It's a nice park, too. I'm excited to have a big crowd in there and pitch in a big league stadium. But it's really going to hit me when I'm the mound tomorrow right before my first pitch."

Walker was the Mariners' first selection in the 2010 Draft as a supplemental first-round selection (43rd overall) out of Yucaipa High School in California. And while he's been on the fast track, that journey has seemed slow at times for the youngster.

"I've been working hard, especially this year," Walker said. "Getting sent back down to Double-A [Jackson], I knew I had a lot of stuff to work on. So, I've been trying to go out there every day with a purpose, with something new to work on. It's been going good for me. This year has been going well. Just to finally get the call up, it feels like all the hard work I've put in is finally paying off."

The 6-foot-4, 210-pound Walker is regarded as one of the premier young right-handers in the game, having pitched in the past two All-Star Futures Games and been listed as the Mariners No. 1 prospect and the No. 4 overall prospect in baseball by MLB.com.

Walker went 7-10 with a 4.69 ERA in 25 starts last year for Jackson and was 4-7 with a 2.46 ERA in 14 starts for Jackson this season before getting promoted to Triple-A Tacoma, where he went 5-3 with a 3.61 ERA in 11 games.

In 141 1/3 innings this season, Walker has 160 strikeouts and 57 walks with a 1.196 WHIP. He was the youngest player in the Pacific Coast League this year and will be the fifth-youngest player in Mariners history to make his debut as a starting pitcher at 21 years and 17 days.

Mariners general manager Jack Zduriencik has set about a 160-inning limit for Walker this season, which means he'll likely only start about three games with Seattle before being shut down. But he's not worrying about that right now.

"I'm just going to go out there and take it day by day, one start at a time," he said. "Whenever they decide to shut me down, they will. But as of right now, I'm going to prepare like I'm going to pitch the rest of the season."

Zduriencik said the decision to call up Walker now was to help "set the tone for Spring Training next year," but he declined to get specific on how much the youngster will throw after being used for 126 2/3 innings last year.

"We are going to be careful," Zduriencik said. "We aren't going to do anything crazy with Taijuan. I think the biggest factor is that he's going to get experience pitching up here. And even if it's short-lived and short innings -- a smaller sample than we might do with someone else -- that's the important factor. He's going to get his feet wet. He's going to understand what it's like to be on a big league mound and have a big league club behind him and the experience of being in a big league ballpark. I think all those things are a positive for him."

When Walker found out he was getting promoted on Wednesday, he immediately called his mom in California.

"She'd already found out through Twitter," Walker said, grinning. "She's always on Twitter, really active. So it wasn't much of a surprise when I called her, but it was still exciting. We face-timed and my brother and sister were there. I got on the phone and they just started screaming. It was awesome."

In roster limbo, Morse not in lineup

LAA@SEA: Morse reaches to make the snowcone catch

HOUSTON -- Mariners outfielder Michael Morse, who has been claimed off waivers by the Orioles, was not in the lineup for a second straight game as Seattle opened a four-game series with the Astros on Thursday.

The Mariners need to move an outfielder before Friday night's game against the Astros in order to add Taijuan Walker to the 25-man roster, and are currently carrying an extra outfielder, so Morse could be part of the solution.

With Morse being claimed by the Orioles, the Mariners could just let him go to Baltimore and save his remaining month's salary, work out a trade to bring some compensation in return or just pull him back off waivers, as they've done with Kendrys Morales after he was claimed earlier in the week.

Morales, who has hit just .152 over the last 12 games, was also given Thursday off. Manager Eric Wedge said his situation was just a one-day rest, but Wedge was more vague when talking about Morse.

"Morales, we feel like he needed a day," Wedge said. "Coming off traveling, it's a good time to do it, first day of this road trip. With Morse, we're just giving him a couple days to … hopefully get him a chance take some BP today. He didn't take BP yesterday. We gave him a day. This is a chance to get out here and do some good early work. He was in the cage earlier, as well. Then we'll get him back in there."

Asked about Morse's health, Wedge said: "He's OK. He's been battling through everything. But he's fine."

After hitting .248 with nine home runs and 14 RBIs in the first 25 games of the season, Morse has struggled after breaking his right pinkie finger and then injuring his hamstring. In 51 games since May 1, Morse has added just four home runs and 13 RBIs while batting .214.

The Mariners currently have six outfielders -- one more than normal -- after activating Franklin Gutierrez off the disabled list on Monday when they designated pitcher Aaron Harang for assignment.

Wedge desires increased veteran leadership

TEX@SEA: Wedge on Hernandez's tough start vs. Rangers

HOUSTON -- Riding a six-game losing streak into Thursday's opening game of an eight-game road trip, Mariners manager Eric Wedge reiterated that his team needs veteran leadership to step up and help the team finish strong.

Wedge said that focus needs to be both on the field and in the clubhouse.

"Two different things," he said. "With the middle of the order, you're looking at the veteran guys there being a big part of what you're doing from an offensive standpoint. And at this point in time at the end of August and September, even more so.

"And with regard to the veteran leadership, it's about sometimes it's important to be a little more vocal from time to time with your team. I think our guys do a great job individually with each other, but sometimes you have to be a little more vocal from a team standpoint when you're playing like we played at home."

Wedge said his message definitely had to do with the team's recent struggles.

"I never say anything without thinking about it," he said. "Every game counts. We've got 30 games left and we have to play each game like it's our last. They look at how you finish. That's more [important] than how you start."

Worth noting

• Catcher Mike Zunino went 0-for-5 with four strikeouts Wednesday while playing DH for Triple-A Tacoma in his second rehab game since returning from a broken hamate bone in his left hand. Zunino is 1-for-7 with a triple, two walks and three runs scored in his two games.

Manager Eric Wedge said reports from Tacoma were positive.

"Everything is on course. He feels good and looks good," Wedge said.

• Former second baseman Dustin Ackley has found success at the plate since changing positions in midseason. While playing as an outfielder, Ackley has hit .319 in 41 games going into Thursday's action. In 44 games at second, Ackley hit .206 this year.