2014 MLB Relative Power Index (RPI),as of the games of September 21,2014 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Angels	.530	96	60	.615	.501	1	757	608	95-61	.608
2	Baltimore Orioles	.528	93	62	.600	.504	3	681	565	92-63	.592
3	Washington Nationals	.518	91	64	.587	.495	2	658	530	94-61	.607
4	Detroit Tigers	.517	86	69	.555	.504	6	733	674	84-71	.542
5	St. Louis Cardinals	.515	87	69	.558	.501	5	597	585	80-76	.510
6	Oakland Athletics	.515	85	70	.548	.504	9	702	552	96-59	.618
7	Kansas City Royals	.512	84	70	.545	.500	10	616	600	79-75	.513
8	Los Angeles Dodgers	.512	89	67	.571	.492	4	680	595	88-68	.566
9	Seattle Mariners	.511	83	72	.535	.502	11	611	519	90-65	.581
10	Pittsburgh Pirates	.509	84	71	.542	.498	8	656	607	84-71	.539
11	New York Yankees	.506	80	75	.516	.503	14	597	628	74-81	.475
12	Cleveland Indians	.505	81	74	.523	.500	12	650	633	80-75	.513
13	Toronto Blue Jays	.504	78	77	.503	.504	15	685	668	79-76	.513
14	San Francisco Giants	.502	84	71	.542	.488	7	635	583	84-71	.543
15	Tampa Bay Rays	.501	75	81	.481	.507	16	598	593	79-77	.504
16	Milwaukee Brewers	.501	80	76	.513	.497	13	633	637	78-78	.497
17	Atlanta Braves	.496	76	79	.490	.497	17	554	573	75-80	.483
18	New York Mets	.496	76	80	.487	.498	18	609	600	79-77	.507
19	Houston Astros	.493	69	87	.442	.510	26	617	701	68-88	.437
20	Cincinnati Reds	.491	72	84	.462	.500	22	572	593	75-81	.482
21	Chicago White Sox	.491	71	84	.458	.501	21	641	729	68-87	.436
22	Miami Marlins	.490	74	81	.477	.494	19	620	651	74-81	.476
23	Boston Red Sox	.490	68	88	.436	.508	24	593	689	66-90	.426
24	Philadelphia Phillies	.489	71	85	.455	.501	23	605	668	70-86	.451
25	San Diego Padres	.487	74	81	.477	.490	20	512	549	72-83	.465
26	Minnesota Twins	.487	66	89	.426	.507	27	680	753	70-85	.449
27	Chicago Cubs	.484	69	87	.442	.498	25	595	687	67-89	.429
28	Texas Rangers	.482	62	93	.400	.509	29	617	753	62-93	.402
29	Colorado Rockies	.474	65	91	.417	.493	28	735	788	73-83	.465
30	Arizona Diamondbacks	.469	62	94	.397	.493	30	594	722	63-93	.404

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.