CINCINNATI -- How does a roster from the 1975 Reds stack up against other great teams from different eras? With Dream Bracket 2: Dream Seasons opening its tournament simulation on Thursday, we are about to find out.

In a first-round matchup, the 1975 Reds drew the 2007 Rockies, a team that went from being 6 1/2 games back in the National League West to securing the NL Wild Card and the NL pennant by winning 21 of its final 22 games (including the postseason). Colorado fell to the Red Sox in the World Series that year.

However, in the first round of Dream Bracket 2, it was the Big Red Machine that advanced over the Rockies in six games.

• Box score and game summary

In NL Region 2, the 1990 Reds dropped a first-round matchup to the '94 Expos on Friday. All series are best of seven.

The simulated competition, featuring many of the greatest teams in baseball history, is being produced by Out of the Park Baseball 21, MLB‘s most realistic strategy game (PC and Mac). Select games will be broadcast by MLB Network’s Scott Braun and Jon Paul Morosi and streamed live on MLB.com and the MLB and MLB Network Twitch channels.

• Full bracket and info

In Round 2, the 1975 Reds will meet the 2012 Nationals, who defeated the 1935 Pittsburgh Crawfords from the Negro Leagues in seven games.

• Complete Dream Bracket 2 rosters

Before that simulation takes place, here is a look at how Round 1 played out vs. the Rockies.

Game 1: Reds 7, Rockies 4
Led by Pete Rose, who went 3-for-4 with three runs scored, the Reds had a 7-0 lead after four innings. Rose led off the bottom of the first inning with a double and scored on a two-out single by Tony Perez. George Foster hit a two-run single in the third inning, and Ken Griffey got the four-run bottom of the fourth started by hitting a single, then scoring on Cesar Geronimo’s triple. Starting pitcher Jack Billingham gave up three earned runs over 6 2/3 innings. Rawly Eastwick handled the final 1 1/3 frames for the save.

Game 2: Rockies 6, Reds 4
The Reds had homers from Perez and Joe Morgan and a 4-1 lead after five innings, but they ceded the advantage in the later frames. The game was even at 4 after eight innings before Colorado got a two-run homer from Willy Taveras off Eastwick in the top of the ninth. Incidentally, Taveras would play for the Reds in 2009.

Game 3: Reds 3, Rockies 2
The series shifted to Coors Field, but it wasn’t offense-a-plenty. Morgan hit a one-out solo homer in the top of the first inning. Ryan Spilborghs tied the game with an RBI double in the bottom of the fourth. A two-run homer by Perez snapped the tie in the top of the eighth. Spilborghs hit a leadoff homer in the bottom of the ninth against Will McEnaney, but Colorado couldn’t add on.

Game 4: Rockies 4, Reds 3
It was a 3-3 game in the bottom of the eighth inning when Yorvit Torrealba hit an RBI single off McEnaney that scored Taveras with the go-ahead run. In the third inning, Perez slugged his third homer of the series with a two-run shot against starter Ubaldo Jimenez.

Game 5: Reds 6, Rockies 3
The Rockies carried a one-run lead into the eighth inning, when the Reds erupted with a six-run rally. A Rose leadoff single started the 12-batter inning, but most of the damage was done with two outs. Against Matt Herges, Griffey hit a two-run single and Geronimo added an RBI single. Rose batted again and delivered a key two-run single, as Reds reliever Tom Carroll walked five batters in the final two innings and gave up two runs in the bottom of the ninth. Representing the tying run, Troy Tulowitzki grounded out to end the game.

Game 6: Reds 9, Rockies 5
With four runs in the third inning and five more in the fifth, the Reds closed out the series over Colorado. Rose hit another RBI single in the third and Morgan followed with an RBI double. Perez then hit a two-out, two-run homer -- his fourth big fly of the series. Two runs were already in during the fifth when Geronimo hit a two-run double and Gary Nolan helped himself with an RBI single. The right-hander gave up five earned runs and nine hits over 5 1/3 innings for the win. Clay Kirby and Clay Carroll combined for 3 2/3 innings of scoreless relief to lock down the game.