Pacheco had three hits and drove in a run for the Rockies, who beat the Miami Marlins 6-5 on Wednesday night.
"I think we were saving them," Pacheco said of the hits. "We faced two tough guys (Jose Fernandez and Nathan Eovaldi) at the beginning of the series, and it's bound to happen with this lineup. We have a bunch of guys who can hit."
Rockies two-time All-Star outfielder Carlos Gonzalez left the game in the bottom of the sixth inning as a precaution due to dizziness, which began during the game without a particular incident.
"He's OK, he wasn't feeling too good and was a little dizzy," Rockies manager Walt Weiss said. "I think he's fine, but he wasn't feeling too good."
Giancarlo Stanton homered and drove in three for the Marlins, who trailed 6-1 in the sixth.
"That's the difference from last year," Stanton said. "That happened frequently, a sense of looking to tomorrow, we already lost. It's good to keep going every game to the last out."
The Marlins trailed 6-4 in the bottom of the ninth with LaTroy Hawkins on the mound. Hawkins allowed a leadoff single to Adeiny Hechavarria and walked Derek Dietrich with two outs, bringing Stanton to the plate.
"You never want to see him walking to the plate to win the game, he's a dangerous hitter, it's well-documented," Weiss said. "It was very uncomfortable with Stanton at the plate."
Stanton nearly ended the game when he hit a long foul ball down the left-field line, which would have won the game if it had stayed fair.
"(The pitch) was in so I wasn't worried that it was going to be fair," Pacheco said. "I've heard that sound before, I heard it a couple innings prior to that, but it worked out for us."
Stanton said: "I should have got it a little deeper. It landed a lot further (foul) than when it went past the pole. It was pretty close."
Two pitches later, Stanton delivered an RBI single on a full-count pitch, scoring Hechavarria and pulling Miami within a run.
Garrett Jones popped out to third base to end the game with Hawkins earning the save.
"Hawk grinded through the inning and got it done," Weiss said.
Jordan Lyles (1-0) won his debut with the Rockies after being acquired in an offseason trade with the Houston Astros for Dexter Fowler. Lyles allowed four runs and five hits in five innings while striking out five and walking one.
"It was stressful, Hawk got his work in tonight, but our first win maybe we can get it going tomorrow and have a good homestand," Lyles said. "Hopefully we're heading in the right direction and put those first two games behind us."
Colorado led 6-1 heading into the sixth inning before Stanton cut the deficit to 6-3 with a two-run home run to right field off Lyles.
"Everyone knows not to go away, I wanted to show him away one time and I shouldn't have," Lyles said. "He's a strong guy."
Reliever Adam Ottavino's wild pitch brought Miami to 6-4 later in the sixth.
Alvarez allowed five consecutive hits in the first inning, including an RBI double by Gonzalez and run-scoring singles by Justin Morneau and Pacheco, giving the Rockies a 3-0 lead.
The Rockies stretched their lead to 6-1 in the fourth, sparked by two errors and a wild pitch by Alvarez, which scored a run. Kevin Slowey relieved Alvarez and immediately walked in a run. Cuddyer also drove in a run with a sacrifice fly.
"We gave them some extra outs, and that probably was the difference in the game," Marlins manager Mike Redmond said.
Alvarez allowed six runs -- three earned -- and seven hits in three innings.
"What got me in trouble was leaving the ball up," Alvarez said.
Slowey struck out five in four scoreless innings.
Gold Glove Award winner Nolan Arenado flashed his ability at third base in the fifth inning when he barehanded a slow roller and threw out Hechavarria at first base. ... Miami's first replay challenge of the season was upheld when Redmond questioned a play at second base in the top of the fourth. ... Marlins 3B Ed Lucas had left hand surgery Wednesday and is expected to be out four to six weeks. ... Miami RHP Jacob Turner will face Colorado LHP Franklin Morales on Thursday in the series finale.