In 1967, both leagues voted to add 2 more teams each, to bring the league total to 24 teams, which started in 1969. Divisional play also began, with each league dividing into East and West division, creating another round of playoff games to decide the pennant winners.
The beginning of the Steroid Era made for some tough decisions when comparing players, as the PED users were a huge part of the game during the decade. However, the top two hitters in the game have maintained a clean track to this point in Ken Griffey Jr. and Frank Thomas.
Then there is Greg Maddux, who won four straight Cy Young awards during the decade and goes down as one of the best of all time. His 1995 season is as dominant as any we've seen in the past 20 years, as he went 19-2 with a 1.63 ERA and 10 complete games.
Though he is a known PED user, Mark McGwire and his 70-home run season in 1998 were still worth a mention. Also notable were Tony Gwynn, Roberto Alomar, Rafael Palmeiro, Barry Larkin, Craig Biggio, Albert Belle and a number of others.
Pitching wise, the trio of Maddux, Roger Clemens and Randy Johnson were clearly a cut above the rest, and the rest of the Atlanta's "Big Three" - Tom Glavine, and John Smoltz were dominant as well .