CHICAGO — The Cubs’ 3-1 win over the Colorado Rockies on Monday featured a battery brand-new to this season: Jameson Taillon and Reese McGuire.

The latter is the freshest face on Chicago’s roster, and he caught just his second game for the team after filling in on short notice Sunday for a sick Carson Kelly in Cincinnati.

McGuire’s two games in a Cubs uniform have been nothing short of a whirlwind. After gaining notoriety for his multi-home run game in a 11-8 comeback win over the Reds, he got right back to business to catch Taillon, whose one-run, seven-strikeout effort over 6.1 innings was one of his most efficient starts of the season.

Even though it was his first time catching Taillon this year, McGuire hardly is a stranger to the veteran right-hander. Both Taillon and McGuire were first-round draft picks by the Pittsburgh Pirates — Taillon No. 2 overall in 2010 and McGuire No. 14 overall in 2013.

“I’ve known Reese for a long time,” Taillon said after the win. “I came up with him a little bit, and I’ve pitched to him before. I’ve changed a lot, but we have a relationship there.”

Taillon didn’t hesitate to express how much he enjoyed having McGuire behind the plate Monday.

“As far as sequencing and game planning go, Reese was fun to work with — in between innings and pregame,” Taillon said. “He was locked in.”

Taillon meant that for McGuire. Even on the pitch that resulted in a home run for the Rockies, Taillon blamed it on himself.

“(McGuire) called a fastball away, and I shook to a changeup,” Taillon said. “I threw a changeup the pitch before, and I thought I could throw a better one. Obviously, it wasn’t better. Part of that hurts because he called something different.”

Despite the mistake, it was the only earned run that Taillon allowed.

“The other part of it is, ‘Well, I can live with (the pitch) because I was convicted in it,’ ” Taillon said.

McGuire also had a big part in stopping a Rockies rally in the sixth inning, when he held on to Nico Hoerner’s throw home for an out that preserved the Cubs’ slim lead. Taillon escaped the jam by striking out the next batter.

“Once we got [that] out, I was able to pitch to the next guy a little carefully,” Taillon said. “It kind of leads to the next hitter, and gives me confidence for that, too.”

Taillon believes McGuire’s seamless transition to the Cubs is a testament to the team’s chemistry this year.

“It’s some pretty cool stuff he’s doing,” Taillon said. “Hopefully, that speaks not only to him but also to our clubhouse. We’re just a team that’s ready to welcome anyone who can help us win.”