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May 26, 2015; Bronx, NY, USA; New York Yankees first baseman Mark Teixeira (25) is congratulated by Carlos Beltran (36) scoring behind Kansas City Royals relief pitcher Joe Blanton (49) during the fifth inning of a baseball game at Yankee Stadium. Mandatory Credit: Adam Hunger-USA TODAY Sports

For an explanation of how the SD Score is calculated, see below.

1 – Houston Astros (35-16); SD Score +2.70, Ranking Last Week – 1

Opponents – vs Tigers (3-1), vs Orioles (3-0)

Houston clobbered Detroit and Baltimore and are still on top of the baseball mountain. They look very hard to beat right now.

2 – New York Yankees (29-18); SD Score +2.34, Ranking Last Week – 2

Opponents – vs Royals (2-1), vs A’s (2-1)

New York continues to roll and are now up 3 games in the AL East standings.

3 – Washington Nationals (30-19); SD Score +2.15, Ranking Last Week – 3

Opponents – vs Mariners (2-1), vs Padres (2-1)

The Nationals were able to get back on track this week, as was Max Scherzer.

4 – Colorado Rockies (33-19); SD Score +1.68, Ranking Last Week – 4

Opponents – at Phillies (2-1), vs Cardinals (2-1)

The Rockies still maintain a game and a half lead over the Dodgers in the NL West and have won 13 of their last 20 games.

5 – Los Angeles Dodgers (31-20) SD Score +3.20, Ranking Last Week – 5

Opponents – vs Cardinals (2-1), vs Cubs (3-0)

The Dodgers are on a roll after beating up the Cardinals and sweeping the Cubs.

6 – Arizona Diamondbacks (31-21); SD Score +2.00, Ranking Last Week – 6

Opponents – vs White Sox (3-0), at Brewers (2-2)

The Diamondbacks are keeping pace in the difficult NL West.

7 – Boston Red Sox (27-22); SD Score +1.10, Ranking Last Week – 16

Opponents – vs Rangers (3-0), vs Mariners (2-1)

Boston has played well and moved into 2nd place in the AL East.

8 – Milwaukee Brewers (27-23); SD Score +0.87, Ranking Last Week – 7

Opponents – vs Blue Jays (0-2), vs Diamondbacks (2-2)

The Brewers were able to salvage a rough week by beating Arizona twice and maintaining a lead in the NL Central.

9 – Minnesota Twins (26-20); SD Score +0.15, Ranking Last Week – 10

Opponents – at Orioles (3-0), vs Rays (1-2)

The Twins are still playing good ball and lead in the AL Central.

10 – Cleveland Indians (25-23); SD Score +0.79, Ranking Last Week – 10

Opponents – at Reds (1-1), vs Reds (0-1), vs Royals (1-2)

The Indians struggled a bit this week and remains a couple games behind the Twins.

11 – Tampa Bay Rays (27-26); SD Score +1.01, Ranking Last Week – 15

Opponents – vs Angels (2-2), at Twins (2-1)

Tampa was able build off of last week and get above .500 in a very difficult division.

12 – St. Louis Cardinals (24-23) SD Score +0.41, Ranking Last Week – 11

Opponents – at Dodgers (1-2), at Rockies (1-2)

The Cardinals weren’t able to rebound after last week’s play and now are barely above .500.

13 – Chicago Cubs (25-24) SD Score +0.28, Ranking Last Week – 13

Opponents – vs Giants (3-1), at Dodgers (0-3)

The Cubs have a look of a .500 team right now. They can beat bad teams but are really struggling with good teams.

14 – Texas Rangers (25-26) SD Score +0.35, Ranking Last Week – 9

Opponents – at Red Sox (0-3), at Blue Jays (1-2)

It looks like an uphill climb for everyone who is not the Astros for the AL West title.

15 – Cincinnati Reds (24-25); SD Score +0.13, Ranking Last Week – 19          

Opponents – vs Indians (1-1), at Indians (1-0), at Phillies (2-1)

The Reds were able to have a good week and are only a couple games out of first.

16 – Baltimore Orioles (25-23); SD Score -0.23, Ranking Last Week – 8

Opponents – vs Twins (0-3), at Astros (0-3)

The Orioles didn’t win a game this week and have now lost 7 in a row.

17 – Chicago White Sox (23-26); SD Score +1.18, Ranking Last Week – 14

Opponents – at Diamondbacks (0-3), vs Tigers (3-1)

The White Sox are hanging around .500 despite a bit of a losing spell lately.

18 – Los Angeles Angels (26-27); SD Score -0.62, Ranking Last Week – 17

Opponents – at Rays (2-2), at Marlins (1-2)

The Angels are consistently hovering at .500 but needed to play better against Miami.

19 – Toronto Blue Jays (23-27); SD Score -0.33, Ranking Last Week – 22

Opponents – at Brewers (2-0), vs Rangers (2-1)

Toronto comes out and has another good week. They’re inching closer to .500 in that difficult AL East.

20 – Detroit Tigers (23-27); SD Score -1.08, Ranking Last Week – 18

Opponents – at Astros (1-3), at White Sox (1-3)

The Tigers had a very full week, playing two 4-game series. They struggled in both and fell below .500.

21 – Seattle Mariners (22-29); SD Score -1.48, Ranking Last Week – 20

Opponents – at Nationals (1-2), at Red Sox (1-2)

The Mariners have had their chances, but they have been unable to put it together to get back in the AL West race at this point.

22 – New York Mets (21-27); SD Score -0.68, Ranking Last Week – 25

Opponents – vs Padres (1-2), at Pirates (2-1)

Matt Harvey was able to get 2 wins this week, but the Mets and everyone else in the East are gonna have a hard time even making a Wild Card.

23 – Pittsburgh Pirates (23-28); SD Score -1.38, Ranking Last Week – 21

Opponents – at Braves (2-2), vs Mets (1-2)

The Pirates may be the most unpredictable team in the Majors. Never know which one will show up.

24 – Oakland A’s (22-27); SD Score -1.76, Ranking Last Week – 24

Opponents – vs Marlins (1-1), at Yankees (1-2)

The A’s are just another team that needs a big winning streak.

25 – Atlanta Braves (21-27); SD Score -1.59, Ranking Last Week – 23

Opponents – vs Pirates (2-2), at Giants (1-2)

The Braves are up and down and find themselves behind the 8-ball.

26 – Kansas City Royals (21-28); SD Score -1.77, Ranking Last Week – 26

Opponents – at Yankees (1-2), at Indians (2-1)

The Royals were at least able to be respectable this week. They need to find a way to get back to .500.

27 – Miami Marlins (18-30); SD Score -1.56, Ranking Last Week – 29

Opponents – at A’s (1-1), vs Angels (2-1)

Miami had a better week, but it’s still an uphill climb.

28 – San Francisco Giants (22-30); SD Score -2.40, Ranking Last Week – 28

Opponents – at Cubs (1-3), vs Braves (2-1)

The Giants had a hard time against the Cubs, but won their last 2 against the Braves. They seem to improve a little each week. Unsure if they can get back into the NL West race.

29 – San Diego Padres (19-33); SD Score -3.79, Ranking Last Week – 29

Opponents – at Mets (2-1), at Nationals (1-2)

Even when they win a couple games, the Padres are in trouble. No other way to look at it.

30 – Philadelphia Phillies (17-31); SD Score -1.67, Ranking Last Week – 27

Opponents – vs Rockies (1-3), vs Reds (1-2)

The Phillies have now lost 19 of their last 25 and it’s getting uglier.

SD Score explanation:

Run production is one of the best measures of how a team is performing and how dominant or bad they are.

The formula takes each team’s runs scored and runs allowed totals and how many standard deviations from the league average they are.

Example: 1927 Yankees

The 27 Yankees score 975 runs (1927 AL average was 762 and SD of team runs for the AL was about 115). Take the difference from the league average (975-762=213) and divide by the SD (115), the 1927 Yankees were 1.85 SD above the league average in runs scored.

They allowed 599 runs (the SD in runs allowed for the 1927 AL was about 88.5), which was 163 runs less than the league average. 163/88.5 gives us a 1.84 SD above the league average in runs allowed.

Add 1.85 and 1.84 to get a final SD Score of +3.69 for the 1927 Yankees, which is amazing.

(SD ranking explanation found in “Baseball Dynasties: The Greatest Teams of All Time” by Rob Neyer and Eddie Epstein)