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4/20/2014 8:17 P.M. ET

Walkup song fits the bill for 'Happy' Hill

LOS ANGELES -- When D-backs second baseman Aaron Hill walks to the plate at Chase Field, Pharrell Williams' "Happy" blares over the speakers.

Because I'm happy
Clap along if you feel like a room without a roof
Because I'm happy
Clap along if you feel like happiness is the truth

Turns out the song is the choice of Hill's young daughter, who is a big fan of the movie "Despicable Me 2," whose soundtrack features the song.

"She said, 'Daddy, this could be our song,'" Hill said. "Then my wife said, 'You should use that music when you come up,' and my daughter got all excited about it. How could I say no to her?"

Truth is the song is a great fit for Hill, who is one of the more content people you will ever meet.

"What's not to be happy about?" Hill said. "I'm married to my best friend, I have an awesome family and I get to come play baseball every day."

Cahill to stay in 'pen, with Bolsinger in rotation

LOS ANGELES -- With his success in the bullpen, the D-backs have no immediate plans to return Trevor Cahill to the starting rotation.

"He's going to stay in the bullpen," D-backs manager Kirk Gibson said.

In his first four starts of the year, Cahill went 0-4 with a 9.17 ERA, and the team decided to shift him to the bullpen and call up right-hander Mike Bolsinger to take his place in the rotation.

In two relief appearances since, Cahill has not allowed a run in four innings.

"Just throwing the ball with much more confidence right now," Gibson said.

Bolsinger allowed seven runs (six earned) over four innings in his first Major League start Saturday night at Dodger Stadium after having thrown out of the bullpen once last week.

"It's how you respond to it," Bolsinger said after the start. "Each time I've been out there, I've kind of learned. I learned a lot from my first time out and I kind of learned a lot from this start. Hopefully I can take it on to the next one."

Gibson said Sunday that as far as he knew, Bolsinger would start Thursday against the Cubs at Wrigley Field.

Pollock leaves game early with tight neck

LOS ANGELES -- D-backs outfielder A.J. Pollock was forced to leave Sunday's 4-1 loss to the Dodgers in the sixth inning after he experienced tightness on the left side of his neck.

Pollock said he first felt pain in the area when he swung and missed at a pitch in the third inning.

"It locked up," Pollock said. "It started off where I couldn't really turn left with it. I just figured it was going to kind of loosen up, but then the whole thing just locked up."

Pollock experienced a similar issue on the right side of his neck in Denver earlier this year, and he did not have to miss any time.

"The neck is one of those things where hopefully you go to bed and wake up and it feels better," Pollock said. "But right now it's pretty locked up."

Worth noting

• Bolsinger struggled to locate his curveball in his start Saturday night against the Dodgers.

"That's something I'm going to have to work on," he said. "That's been my go-to pitch throughout all of professional baseball. I'm going to have to get that one back."

• The D-backs have extended their affiliation with the Class A short-season Hillsborough Hops in the Northwest League.

• D-backs third-base coach Glenn Sherlock reached into his locker for his batting practice jersey Saturday, put it on and headed out to the field.

Not long after, he made a quick trip back to the clubhouse. Turns out the wrong jersey was hanging in his locker and he had put on the one belonging to bench coach Alan Trammell.

• The D-backs will wear the uniform of the Kansas City Packers on Wednesday when they take on the Cubs in the 100th anniversary of the first game at Wrigley Field.

The Packers were the Cubs' opponent on April 23, 1914. It was the Packers' first game in franchise history, and the team was disbanded after the 1915 season.

Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.