My plan would not add an extra round, it would add an extra game, well 2, 1 in each league. 3 division winners, 2 WC teams play each other the Tuesday after the season ends, winner goes on to face the #1 seed. The punishes WC teams for not winning their division, and greatly benefits the #1 seed by getting to a player a team that had to probably throw their best pitching in that 1 game playoff the day before. 1 game play-ins are great TV. But we only get them in the event of a tie. This opens up the chance at the playoffs to more teams, including those forced to face economically superior teams in their division. It actually makes it more "prestigious" to win your division, as only 20% of the teams earn the right to a playoff series, while the other 4 playoff teams have to play a 1game play-in to get there. I think this serves several purposes, it adds emphasis on winning your division, it makes being the #1 seed meaningful, it opens up the playoffs to more teams, but also makes it tougher on you if you get in via WC. MLB has to maintain interest in as many markets as possible. As it stands, you typically only have the interest in 8 playoffs markets, and then maybe 2-3 cities that came up just short. You add two WC and suddenly maybe 14-15 cities maintain their hopes into September. In effect it would be like having 1998 (Cubs vs. Giants) every year. I like it. I'd also like to see consideration given to giving the #1 seed a super home field advantage (4 of 5 games at home), because that also distinguishes the best team in the league from the others. It would mean matching up the #1 seed against the wild card in the first round even if they're from the same division (not currently done), but I'm in favor of that anyway. Under my plan the top division winner would host games 1, 2, 4, and 5, and the wild card would host game 3.