2014 MLB Relative Power Index (RPI),as of the games of September 4,2014 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Angels	.529	84	55	.604	.504	1	647	536	82-57	.593
2	Baltimore Orioles	.526	82	57	.590	.504	3	611	526	80-59	.574
3	Oakland Athletics	.522	79	60	.568	.507	4	650	496	88-51	.632
4	Washington Nationals	.515	79	59	.572	.496	2	592	484	83-55	.599
5	Kansas City Royals	.515	77	61	.558	.501	6	562	535	72-66	.525
6	St. Louis Cardinals	.514	77	63	.550	.502	12	536	538	70-70	.498
7	Seattle Mariners	.513	76	63	.547	.502	10	556	455	83-56	.599
8	Detroit Tigers	.513	77	63	.550	.501	7	660	614	75-65	.536
9	Los Angeles Dodgers	.510	78	62	.557	.494	5	575	518	77-63	.552
10	Toronto Blue Jays	.508	72	67	.518	.505	16	614	606	70-69	.507
11	New York Yankees	.506	72	66	.522	.501	14	549	576	66-72	.476
12	Cleveland Indians	.505	71	67	.514	.502	15	590	579	70-68	.509
13	Atlanta Braves	.503	73	67	.521	.497	13	521	503	72-68	.518
14	Pittsburgh Pirates	.502	71	68	.511	.500	11	578	570	70-69	.507
15	San Francisco Giants	.502	76	64	.543	.488	9	582	522	78-62	.554
16	Milwaukee Brewers	.501	73	67	.521	.495	8	587	585	70-70	.502
17	Tampa Bay Rays	.498	67	74	.475	.506	17	544	538	71-70	.506
18	New York Mets	.494	66	74	.471	.501	21	538	551	68-72	.488
19	Cincinnati Reds	.493	66	74	.471	.500	20	526	526	70-70	.500
20	Miami Marlins	.492	67	71	.486	.494	18	562	589	66-72	.477
21	Chicago White Sox	.490	63	76	.453	.502	22	586	667	61-78	.436
22	Houston Astros	.490	61	79	.436	.507	27	558	644	60-80	.429
23	Philadelphia Phillies	.489	64	75	.460	.499	23	548	604	63-76	.452
24	Minnesota Twins	.488	61	79	.436	.506	26	618	662	65-75	.466
25	San Diego Padres	.488	66	73	.475	.493	19	449	478	65-74	.469
26	Boston Red Sox	.488	61	79	.436	.505	25	540	613	61-79	.437
27	Chicago Cubs	.486	64	76	.457	.495	24	540	583	65-75	.462
28	Arizona Diamondbacks	.475	59	81	.421	.493	28	541	633	59-81	.422
29	Texas Rangers	.473	53	87	.379	.505	30	549	694	54-86	.385
30	Colorado Rockies	.470	56	84	.400	.493	29	647	731	61-79	.439

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.