2014 MLB Relative Power Index (RPI),as of the games of September 11,2014 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	91	55	.623	.502	1	712	561	90-56	.617
2	Baltimore Orioles	.526	86	59	.593	.504	2	638	544	84-61	.579
3	Oakland Athletics	.518	81	65	.555	.506	5	676	517	92-54	.631
4	Washington Nationals	.515	83	62	.572	.496	3	620	511	86-59	.595
5	Detroit Tigers	.514	80	66	.548	.503	10	685	638	78-68	.535
6	Kansas City Royals	.513	80	65	.552	.501	6	580	560	75-70	.518
7	St. Louis Cardinals	.513	80	67	.544	.502	7	564	562	74-73	.502
8	Los Angeles Dodgers	.512	83	63	.568	.493	4	605	533	82-64	.563
9	Seattle Mariners	.510	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	Cleveland Indians	.507	76	69	.524	.501	11	613	599	74-71	.512
12	New York Yankees	.506	75	69	.521	.501	14	571	594	69-75	.480
13	Pittsburgh Pirates	.505	77	69	.527	.498	13	617	589	76-70	.523
14	San Francisco Giants	.504	81	65	.555	.488	8	612	537	82-64	.565
15	Atlanta Braves	.502	75	71	.514	.498	12	539	531	74-72	.507
16	Tampa Bay Rays	.500	70	77	.476	.508	18	568	563	74-73	.504
17	Milwaukee Brewers	.500	76	71	.517	.495	15	612	616	73-74	.497
18	New York Mets	.495	71	76	.483	.499	20	566	569	73-74	.497
19	Cincinnati Reds	.494	70	77	.476	.500	21	550	557	73-74	.494
20	Miami Marlins	.494	71	74	.490	.495	17	595	611	71-74	.487
21	Houston Astros	.492	65	81	.445	.508	27	577	661	63-83	.432
22	Philadelphia Phillies	.491	67	79	.459	.501	22	574	635	66-80	.450
23	Chicago White Sox	.490	66	80	.452	.502	25	598	690	63-83	.429
24	Boston Red Sox	.489	64	83	.435	.507	24	567	648	64-83	.434
25	Minnesota Twins	.487	62	84	.425	.507	26	639	704	66-80	.452
26	San Diego Padres	.484	67	78	.462	.492	19	465	510	66-79	.454
27	Chicago Cubs	.481	64	82	.438	.496	23	550	631	63-83	.432
28	Texas Rangers	.473	54	92	.370	.508	30	564	729	55-91	.374
29	Arizona Diamondbacks	.472	59	87	.404	.494	28	549	663	59-87	.407
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.