1969 New York Mets
Regular Season: 100-62
Postseason: Won NLCS 3-0 vs. Atlanta Braves, Won WS 4-1 vs. Baltimore Orioles
Top OPS+ Batting: LF Cleon Jones
Top ERA+ Pitching: SP Tom Seaver
vs.
1931 St. Louis Cardinals
Regular Season: 101-53
Postseason: Won WS 4-3 vs. Philadelphia Athletics
Top OPS+ Batting: OF Chick Hafey
Top ERA+ Pitching: SP Bill Hallahan
Results: Started out very close, the '31 Cardinals only held a 1 game lead through mid June, but then the Cardinals won 12 out of 15 in late June early July to take control, and ultimately win 87-74. Paul Derringer and Syl Johnson each had 20 win seasons for the '31 Cardinals, while Chick Hafey and Frankie Frisch each had .300 batting seasons. The '69 Mets had 3 players(Jones, Agee and Shamsky) each bat .300 while Shamsky added 46 HRs, but their pitching was not good enough to subdue the Cardinals. Tom Seaver pitched a 1 hitter in one of his starts for the '69 Mets.
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2016 Chicago Cubs
Regular Season: 103-58-1
Postseason: Won NLDS 3-1 vs. SF Giants, Won NLDS 4-2 vs. LA Dodgers, Won WS 4-3 vs. Cleveland Indians
Top OPS+ Batting: 3B Kris Bryant
TOP ERA+ Pitching: SP Kyle Hendricks
vs.
1967 St. Louis Cardinals
Regular Season: 101-60
Postseason: Won WS 4-3 vs. Boston Red Sox
Top OPS+ Batting: 1B Orlando Cepeda
Top ERA+ Pitching: SP Steve Carlton
Results: By far the closest series so far. The '16 Cubs jumped out to a 17 game lead by mid summer, but the '67 Cardinals were able to eat away at a 9 game September 1st defecit to eventually tie the series at 81-81 and force a tiebreaker. Jorge Solar hit a home run in the 9th inning of the tiebreaker game to give the '16 Cubs the game 5-3 and a 82-81 series win. Jon Lester went 17-12 with a 3.02 ERA for the '16 Cubs pitching staff. Steve Carlton went 17-11 with a 3.45 ERA for the Cardinals pitching staff.
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2004 Boston Red Sox
Regular Season: 98-64
Postseason: Won ALDS 3-0 vs. Anaheim Angels, Won ALCS 4-3 vs. NY Yankees, won WS 4-0 vs. St. Louis Cardinals
Top OPS+ Batting: LF Manny Ramirez
Top ERA+ Pitching: SP Pedro Martinez
vs.
1995 Cleveland Indians
Regular Season: 100-44-0(Strike Shortened)
Postseason: Won ALDS 3-0 vs. Boston Red Sox, Won ALCS 4-2 vs. Seattle Mariners, Lost World Series 4-2 vs. Atlanta Braves
Top OPS+ Batting: LF Albert Belle
Top ERA+ Pitching: SP Charles Nagy
Results: This series went to the wire as well, as the '95 Indians defeated the '04 Red Sox 82-81. The '04 Red Sox had an 8 game lead in late June, but they couldn't hold on, as the Indians stormed ahead in August. By September 10th the Indians had built a 5 game lead, which the Red Sox managed to erase to force a tiebreaker game at 81-81. The '95 Indians won the tiebreaker 8-1, Manny Ramirez went 3 for 5 with 4 RBI and a double. Jim Thome and Manny Ramirez each had a .300 average and 30 HR for the '95 Indians. David Ortiz had a .302 AVG and 27 HR for the '04 Red Sox. Pedro Martinez battled injuries throughout the season or the '04 Red Sox may have been more dominant.
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2015 Kansas City Royals
Regular Season: 95-67
Postseason: Won ALDS 3-2 vs. Houston Astros, Won ALCS 4-2 vs. Toronto Blue Jays, Won WS 4-1 vs. NY Mets
Top OPS+ Batting: DH Kendrys Morales
Top ERA+ Pitching: SP Edinson Volquez
vs.
1977 Philadelphia Phillies
Regular Season: 101-61
Postseason: Lost NLCS 3-1 vs. LA Dodgers
Top OPS+ Batting: LF Greg Luziski
Top ERA+ Pitching: SP Steve Carlton
Results: The '77 Phillies dominated this one and won 98-64. All 4 Phillies starters won 15 games or more, and Greg Luzinski and Mike Schmidt both hit over 35 HR. The '15 Royals had 4 players with over 20 HR(Moustakas, Cain, Hosmer, and Perez) but bad pitching doomed them from the start and they were never really in it.
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2007 Colorado Rockies
Regular Season: 90-73
Postseason: Won ALDS vs. Philadelphia Phillies 3-0, Won ALCS vs. Arizona Diamondbacks 4-0, Lost WS vs. Boston Red Sox 4-0
Top OPS+ Batting: LF Matt Holliday
Top ERA+ Pitching: SP Aaron Cook
vs.
1971 Pittsburgh Pirates
Regular Season: 97-65
Postseason: Won NLCS 3-1 vs. SF Giants, Won WS 4-3 vs. Baltimore Orioles
Top OPS+ Batting: LF Willie Stargell
Top ERA+ Pitching: SP Steve Blass
Result: The '71 Pirates jumped ahead early, grabbing a 10 game lead after 2 months of the season. The '07 Rockies starting playing better in August, and they were able to get as close as 4 games but could not manage to win the series, losing 83-79 to the '71 Pirates. Hebner and Stargell each had 35 HR seasons for the Pirates, while Roberto Clemente hit .300. The highest Rockies home run total was 21 by Garrett Atkins even though the Rockies played half the games in Coors field.
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1986 Houston Astros
Regular Season: 96-66
Postseason: Lost NLCS 4-2 vs. NY Mets
Top OPS+ Batting: 3B Denny Walling
Top ERA+ Pitching: SP Mike Scott
vs.
1982 Milwaukee Brewers
Regular Season: 95-67-1
Postseason: Won ALCS 3-2 vs. California Angels, Lost WS 4-3 vs. St. Louis Cardinals
Top OPS+ Batting: SS Robin Yount
Top ERA+ Pitching: SP Pete Vucovich
Results: Shockingly, the '86 Astros demolished the '82 Brewers 106-56.Mike Scott and Bob Knepper both had 20 win seasons and sub 2.50 ERA's for the '86 Astros, while their offense clobbered Brewers pitching with six starters hitting over .300. The '82 Brewers only had one player, Paul Moliter, hit .300.
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1934 Detroit Tigers
Regular Season: 101-53
Postseason: Lost WS 4-3 vs. St. Louis Cardinals
Top OPS+ Batting: 1B Hank Greenberg
Top ERA+ Pitching: SP Schoolboy Rowe
vs.
1979 Pittsburgh Pirates
Regular Season: 98-64-1
Postseason: Won NLCS 3-0 vs. Cincinatti Reds, Won WS 4-3 vs. Baltimore Orioles
Top OPS+ Batting: RF Dave Parker
Top ERA+ Pitching: SP Bruce Kison
Results: It was close for the first 60 games as the '34 Tigers only lead by 2 games on June 1st, but by July 1st the lead had expanded to 13 games, and by August it was 20 games, resulting in a 93-69 win for the '34 Tigers. Schoolboy Rowe and Tommy Bridges each had 20 win seasons for the '34 Tigers, and Hank Greenberg smashed a .330/40 HR clip. Dave Parker and Willie Stargell each batted over .290 and 35 HR for the '79 Pirates but it wasn't enough to keep it close in the end.