Down 10-1 in the third inning, the Rockies did everything they could to come back.
And they did, matching the biggest rally in team history and stunning the Atlanta Braves 12-10 Wednesday on Troy Tulowitzki's go-ahead RBI single in the eighth.
Colorado also rallied from nine runs down to beat Florida 18-17 on July 4, 2008.
"What an effort," Tracy said. "The thing I've fallen in love with these players is they don't quit. We were short-handed pitching and then offensively, here we go, and we started chipping away.
''This is the icing on the cake."
The Rockies gradually cut into the deficit against the NL East leaders before taking the lead with four runs in the eighth. Carlos Gonzalez hit a tying, two-run single with two outs, and Tulowitzki and Todd Helton followed with RBI singles.
The Rockies finished off a three-game sweep of the Braves.
With one out in the eighth and the Rockies trailing 10-8, reliever Jonny Venters (4-2) walked Chris Iannetta and Melvin Mora singled. One out later, Dexter Fowler walked and Gonzalez singled. Kyle Farnsworth relieved, and Tulowitzki and Helton delivered their hits.
"I got a couple pitches up, but I think the walks are what really did me in overall," Venters said. "This one hurts, but we've got a game day after tomorrow and we'll get right back out there and try to win."
Matt Belisle (6-4) picked up the win, pitching 1q innings in relief.
The Braves return to Atlanta to open a seven-game stand at home on Friday, where they are a major-league best 44-17.