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Ryan Zimmerman of the Washington Nationals (Photo by G Fiume/Getty Images)

For an explanation of how the SD Score is calculated, see below. Teams will take big jumps forwards and backwards in the first month as the stat ‘sample size’ is small.

1 – New York Yankees (20-9); SD Score +2.83 Ranking Last Week – 2

Opponents – vs Blue Jays (2-1), at Cubs (3-0)

Aaron Hicks had a big week and the Yankees were able to dominate, even sweeping the Champs.

2 – Washington Nationals (21-10); SD Score +2.48, Ranking Last Week – 1

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

Ryan Zimmerman has been flat-out dominant as the Nationals are surging.

3 – Houston Astros (21-11); SD Score +1.85 , Ranking Last Week – 3

Opponents – vs Rangers (3-1), at Angels (2-1)

The Astros were able to get a big series win over Texas and then put the Angels under .500 to extend their AL West lead to 5 ½ games.

4 – Colorado Rockies (20-12); SD Score +0.23, Ranking Last Week – 5

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

The Rockies continue to impress as they have the NL Lead. They are now 9-0 in one-run games.

5 – Baltimore Orioles (20-10); SD Score +0.79, Ranking Last Week – 7

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

The Orioles are another team that gets it done in tight spots, as they are 7-1 when it’s a one-run game.

6 – Los Angeles Dodgers (17-14) SD Score +2.25, Ranking Last Week – 10

Opponents – vs Giants (1-2), at Padres (2-0)

When the Dodgers win, they usually win big. Now they just need to win more close games.

7 – Cincinnati Reds (17-14); SD Score +1.01, Ranking Last Week – 21           

Opponents – vs Pirates (3-1), vs Giants (3-0)

After losing 8 of 10, the Reds came out this week and wiped out the Pirates and Giants.

8 – Cleveland Indians (17-13); SD Score +0.72, Ranking Last Week – 4

Opponents – at Tigers (1-2), at Royals (2-1)

The Indians have steadily gotten better to take control of the AL Central, winning 12 of their last 20 games.

9 – Boston Red Sox (17-14); SD Score +1.07, Ranking Last Week – 11

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

Again Boston didn’t bring their A game against an AL East opponent, but are still very much in the mix for the AL East title.

10 – Arizona Diamondbacks (18-15); SD Score +1.00, Ranking Last Week – 6

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

The Padres weren’t on the schedule and the Diamondbacks paid the price, losing to the top two teams in the NL.

11 – St. Louis Cardinals (16-14) SD Score +0.43, Ranking Last Week – 18

Opponents – vs Brewers (1-2), at Braves (3-0)

The Cards are now right in the thick of the NL Central race and have won 4 of their last 5 games.

12 – Chicago Cubs (16-15) SD Score +0.39, Ranking Last Week – 8

Opponents – vs Phillies (3-1), vs Yankees (0-3)

The series against the Yankees hurt their ranking, but they’re only a game out of first.

13 – Chicago White Sox (15-15); SD Score +0.83, Ranking Last Week – 9

Opponents – at Royals (2-2), at Orioles (0-3)

The White Sox have lost 6 of their last 8 and at the moment, they look like an average team at best.

14 – Tampa Bay Rays (16-17); SD Score +0.35, Ranking Last Week – 16

Opponents – at Marlins (3-1), vs Blue Jays (1-2)

Tampa had a chance to get over .500, but could not get it done against Toronto. Perhaps they will fare better against the Royals.

15 – Milwaukee Brewers (16-16); SD Score +0.25, Ranking Last Week – 17

Opponents – at Cardinals (2-1), at Pirates (1-2)

The Brewers are maintaining their mediocrity, but they are still exceeding expectations at this point.

16 – Minnesota Twins (15-14); SD Score -0.42, Ranking Last Week – 12

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

Minnesota definitely looked better this week and got above .500. Unfortunately, they ended the week by giving up 28 runs to Boston in their last two games.

17– Seattle Mariners (15-17); SD Score +0.31, Ranking Last Week – 24

Opponents – vs Angels (2-1), vs Rangers (2-1)

The Mariners are looking much better as they are winning games differently. They have now won 7 of their last 10.

18 – Detroit Tigers (15-15); SD Score -0.49, Ranking Last Week – 19

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

Fortunately for the Tigers, they played well against Cleveland. Now they need to put a winning streak together.

19 – Philadelphia Phillies (13-17); SD Score +0.15, Ranking Last Week – 13

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

This wasn’t the best week for the Phillies, but at least they won a game against both the Cubs and the Nationals, or their losing streak would have hit 10 in a row.

20 – Miami Marlins (13-17); SD Score -0.26, Ranking Last Week – 14

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

The Marlins had another difficult week as they lost five of seven and have now lost nine of their last twelve games.

21 – Los Angeles Angels (16-17); SD Score -1.07, Ranking Last Week – 20

Opponents – at Mariners (1-2), vs Astros (1-2)

After their winning streak last week, the Angels stumbled this week but have an opportunity to jumpstart themselves in Oakland.

22 – Pittsburgh Pirates (14-17); SD Score -0.80, Ranking Last Week – 23

Opponents – at Reds (1-3), vs Brewers (2-1)

The Pirates are a very unpredictable team as they play well when you think they’re done and play poorly when you think they’re back.

23 – New York Mets (14-16); SD Score -0.96, Ranking Last Week – 26

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

The Mets had a solid week and have climbed back into the division race.

24 – Texas Rangers (13-19) SD Score -0.37, Ranking Last Week – 15

Opponents – at Astros (1-3), at Mariners (1-2)

Texas is struggling and giving up a lead yesterday to Seattle was a gut punch. They have lost 7 of their last 10 and are in last place.

25 – Oakland A’s (14-17); SD Score -1.98, Ranking Last Week – 25

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

The A’s are still struggling, but it could be a lot worse.

26 – Toronto Blue Jays (11-20); SD Score -1.13, Ranking Last Week – 28

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

The Blue Jays need a winning streak or they will be in last for a long time.

27 – Atlanta Braves (11-18); SD Score -1.63, Ranking Last Week – 22

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

The Braves are now 0-6 against teams that have a .500 record or better. Next up, Houston.

28 – Kansas City Royals (10-20); SD Score -1.59, Ranking Last Week – 30

Opponents – vs White Sox (2-2), vs Indians (1-2)

The Royals were able to end their losing streak, but now they need to win a series.

29 – San Diego Padres (12-20); SD Score -2.81, Ranking Last Week – 27

Opponents – vs Rockies (1-2), vs Dodgers (0-2)

Tough week for the Padres as they fell to two better teams in their division.

30 – San Francisco Giants (11-21); SD Score -3.44, Ranking Last Week – 29

Opponents – at Dodgers (2-1), at Reds (0-3)

The bottom has really dropped out for the Giants. They look bad. And the team bus broke down last night.

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)