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7/24/2013 2:27 A.M. ET

Lake gives Cubs jolt in first taste of big leagues

PHOENIX -- Could Junior Lake be the Cubs' own Yasiel Puig?

It's a little early, but Lake has certainly provided a spark since he was promoted from Triple-A Iowa on Friday. Cubs manager Dale Sveum said he will keep Lake in the leadoff spot for now.

"He's a real dynamic player who can do things in that spot," Sveum said. "You ride that as long as you can."

Lake hit his first Major League home run on Monday, part of his first four-hit game against the D-backs. He homered again Tuesday on a 3-for-5 night, lifting his average to .545.

"It's still a small sample," Sveum said of Lake, who has 12 hits in his first 22 at-bats. "There's no question in my mind for four days, he's sparked a couple wins, and [Monday], he took over the game and basically won the game. When you get down to it, in a 162-game season, when you have those kind of impact players who can control the game, you look back and it's like 14 wins where he took over. That's what you'd like at every position. Those are the kind of players you have to have."

There will be growing pains. Lake is making the transition from infield to outfield at the big league level. Sveum said he's noticed that Lake was having a tough time reading big swings on bloop hits, and how to play them.

"Those are things that come with repetition," Sveum said. "A guy like [David] DeJesus has been out there for so long, he's really good at that."

Lake, ranked No. 11 among the Cubs' top prospects, was a different player this spring than in 2012 when Sveum first saw him.

"When guys know they're a phone call away [from the big leagues], it changes things," Sveum said.

Gillespie going all out on defense for Cubs

PHOENIX -- Cole Gillespie knows not to run into brick walls. On Monday, he learned there was just enough padding on the wall along the right-field line at Chase Field. The Cubs outfielder tested it again on Tuesday.

In the second inning on Monday, Gillespie grabbed Aaron Hill's fly ball and slid hard into the wall along the right-field line. Somehow, he held onto the ball.

"It shook me up a little bit for sure," he said Tuesday. "My knees took the brunt of it, although I didn't feel that at the time. It jarred my back more than anything. There was a little pinching going on there. I woke up this morning and felt it in my calf."

He was in the lineup on Tuesday, and made another standout, wall-crashing catch in the first on A.J. Pollock's fly ball, slamming into the outfield fence.

"As long as he catches it and you come up healthy, [it's OK]," Cubs manager Dale Sveum said.

Gillespie needs to work on his timing.

"That's the way I like to play," he said of his aggressive style. "Next time, I'll slide a little earlier so I don't go full speed into it. ... If you're going to make a web gem, it's worth it. Just slide earlier."

Sveum ejected after defending Ransom

PHOENIX -- Cubs manager Dale Sveum doesn't like when umpires look at his players the wrong way, and on Tuesday night, it led to his fourth ejection of the season.

Cody Ransom was called out on strikes to end the third inning against Arizona's Patrick Corbin, then flipped his bat and helmet, and tossed his batting gloves. Home plate umpire Dana DeMuth followed Ransom, and apparently something was said from the Cubs dugout that the ump didn't like.

DeMuth signaled that Sveum was ejected, and the manager then ran onto the field to argue. The two appeared to be laughing as their discussion ended.

"I didn't quite like the way he handled staring at Cody and following him," Sveum said. "It was over with. He didn't need to keep staring at my player and baiting him."

Why were they laughing at the end?

"Yeah, I was," Sveum said. "It was funny what he said."

Sveum wouldn't share that part of the conversation.

Last Sept. 5 in Washington, Sveum said he'd had enough of umpire Larry Vanover "eyeballing" him in the dugout, and that led to his ejection in the fifth. On April 20 in Milwaukee, Sveum was tossed in the sixth when he defended Jeff Samardzija after the pitcher objected to a call by home plate umpire Chris Guccione, who took off his mask to continue the discussion.

Tuesday's ejection was the eighth of Sveum's managerial career with the Cubs.

Extra bases

• Outfielder David DeJesus could be activated from the disabled list soon. DeJesus has been sidelined since June 14 with a sprained right shoulder and was playing in Arizona for the Cubs' Rookie League team.

"Everything is going really well right now," Cubs manager Dale Sveum said of DeJesus' rehab.

• Sveum and other Cubs staffers toured the team's new Spring Training facility in Mesa on Tuesday.

"It's beautiful," Sveum said. "Obviously, we're a few months away from the final touches being done, but you can see it all coming together and how cool it is and the facility and the space and the weight room are going to be phenomenal. It's just nice that it's all ours, I think is the biggest thing, and that stadium will be something to see."

He even got to peek at where his office will be.

"It's just cinder blocks now," he said.

The new facility is in east Mesa, located near the intersection of highways 101 and 202.

• Right-hander Jake Arrieta, acquired from the Orioles in the Scott Feldman deal, could start for the Cubs on Tuesday when they play a makeup doubleheader against the Brewers. Arrieta is 0-2 with a 5.17 ERA in four starts at Triple-A Iowa, giving up nine earned runs over 15 2/3 innings.

• Kris Bryant, the Cubs' No. 1 Draft pick, joined Class A Boise on Tuesday. Bryant recorded his first professional hit, a double, and drove in two runs on Monday for the Cubs' Rookie League team. Bryant played two games for the Cubs' Rookie League team and provided all the offense in a 2-1 win over the Royals on Monday.

The third baseman will be joined in Boise by third-round pick Jacob Hannemann. Bryant, picked second overall, will be the highest Draft pick to ever play for the Hawks. Lou Montanez (2000) and Josh Vitters (2007), who were both taken third overall, did play for the team.

• Scott Baker, rehabbing from Tommy John surgery on his right elbow, was scheduled to make his third rehab start for Class A Kane County on Wednesday. So far, Baker has given up 10 earned runs over 5 2/3 innings in two games.

Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.