2014 MLB Relative Power Index (RPI),as of the games of September 10,2014 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Angels	.532	90	55	.621	.503	1	705	558	89-56	.615
2	Baltimore Orioles	.526	86	59	.593	.503	2	638	544	84-61	.579
3	Oakland Athletics	.520	81	64	.559	.507	5	676	516	92-53	.632
4	Kansas City Royals	.515	80	64	.556	.501	6	577	554	75-69	.520
5	Washington Nationals	.514	82	62	.569	.496	3	614	509	85-59	.593
6	Detroit Tigers	.514	80	66	.548	.502	10	685	638	78-68	.535
7	St. Louis Cardinals	.513	80	66	.548	.502	7	564	561	73-73	.503
8	Los Angeles Dodgers	.512	83	63	.568	.493	4	605	533	82-64	.563
9	Seattle Mariners	.511	79	66	.545	.499	9	574	471	87-58	.598
10	Toronto Blue Jays	.508	76	69	.524	.503	16	656	623	76-69	.526
11	New York Yankees	.505	74	69	.517	.501	14	566	590	69-74	.479
12	Cleveland Indians	.505	74	69	.517	.501	11	603	597	72-71	.505
13	Pittsburgh Pirates	.504	76	69	.524	.498	13	613	588	76-69	.521
14	San Francisco Giants	.504	80	65	.552	.488	8	606	535	81-64	.562
15	Atlanta Braves	.503	75	71	.514	.499	12	539	531	74-72	.507
16	Tampa Bay Rays	.501	70	76	.479	.508	18	564	558	74-72	.505
17	Milwaukee Brewers	.499	75	71	.514	.495	15	608	614	72-74	.495
18	New York Mets	.496	71	75	.486	.499	20	564	563	73-73	.501
19	Miami Marlins	.495	71	73	.493	.495	17	593	607	70-74	.488
20	Houston Astros	.493	65	81	.445	.509	27	577	661	63-83	.432
21	Cincinnati Reds	.492	69	77	.473	.499	21	549	557	72-74	.493
22	Philadelphia Phillies	.492	67	78	.462	.502	22	573	631	66-79	.452
23	Chicago White Sox	.488	65	80	.448	.502	25	597	690	62-83	.428
24	Minnesota Twins	.488	62	82	.431	.507	26	637	694	66-78	.457
25	Boston Red Sox	.488	63	83	.432	.506	24	561	645	63-83	.431
26	San Diego Padres	.484	67	78	.462	.492	19	465	510	66-79	.454
27	Chicago Cubs	.481	64	82	.438	.495	23	550	631	63-83	.432
28	Texas Rangers	.474	54	91	.372	.507	30	561	722	55-90	.376
29	Arizona Diamondbacks	.472	59	86	.407	.494	28	547	657	59-86	.409
30	Colorado Rockies	.470	59	87	.404	.492	29	665	744	65-81	.444

Glossary

• W: Wins
• L: Losses
• PCT: Winning percentage
• RPI: Relative Power Index+
• SOS: Strength of schedule

• PWR: ESPN Power Ranking
• RS: Runs scored
• RA: Runs allowed
• EXW-L: Expected W-L*
• EXWP: Expected winning percentage*

+The basic formula is 25% team winning percentage, 50% opponents' average winning percentage, and 25% opponents' opponents' average winning percentage.
*ExW-L and ExWP are derived from Bill James' Pythagorean theorem of baseball: Runs scored [squared] / (Runs scored [squared] + runs allowed [squared]). This formula was designed to relate a team's runs scored and runs allowed to its won-lost record.