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Frank Thomas or Mark McGwire? Ranking MLB's Top 20 First Basemen of the 1990s

In the weeks to come, we'll be taking a position-by-position look at the best MLB players of the 1990s. Who's ready for some nostalgia?

Up first, a stacked first base position.

A player's peak performance, his full statistical body of work during the 1990s and his postseason production were all taken into account when determining the final rankings.

While no single stat was the end-all, be-all in this conversation, OPS+ and WAR/500 are two important ones to know.

OPS+ is simply a hitter's on-base percentage plus slugging percentage, adjusted to take into account the ballparks in which he is hitting.