"They're not perfect, they're not machines, but they're very consistent and that's what we want," manager Ned Yost said.
In the 22 games prior to Saturday, the Royals had a 13-9 record, and the bullpen's ERA was 2.28 with 70 strikeouts.
"If we can throw strikes, we're all going to be successful. For the most part, we've done a good job of that," Holland said. "I walked the leadoff batter Friday night -- you never want to see that in a two-run game -- but I was able to get out of it. But, for the most part, we just try to keep it rolling from last year."
Big Jonathan Broxton, who took over the closer's role from surgically-sidelined Joakim Soria, notched his 12th save in Friday night's 2-0 win over the A's.
"They're kind of the same guy," Holland said. "Broxton is quiet, too. But he knows how to relax and have a good time out there, too. There's also that switch that Soria had where it gets sixth and seventh inning and you know it's time to start getting cranked up. You can just see [Broxton's] mentality change, and he goes into his little routine of stretching and stuff.
"We hate that Soria is not down there, because he's such a good teammate and asset for us. But we learned so much from him last year, as far as how to go about our business. We still know what we need to do from past experiences -- and Broxton's led by example, the same way Soria did in the past."
The high number of innings pitched, of course, stems from an early-season tendency of all-too-brief outings by the starting pitchers. That's been improving of late, which helps the relievers rest and be sharper when they do appear.
"That's translated into a lot of wins because Ned's able to play matchups," Holland said. "We've got six, eight guys down there that can throw in any situation late in the game, so it makes easy when your starter goes six.
"If you can throw four guys for two innings, you really haven't used anybody, because you're always available that next day because you're only facing one or two hitters -- three at the most. That goes a long way through the course of the season because you're not having to throw those two innings, then an inning and then having to have a day off."