2014 MLB Relative Power Index (RPI),as of the games of September 15,2014 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Angels	.534	94	56	.627	.503	1	737	573	93-57	.623
2	Baltimore Orioles	.529	90	60	.600	.505	2	655	552	88-62	.585
3	Oakland Athletics	.520	83	66	.557	.507	7	685	523	94-55	.632
4	Detroit Tigers	.517	84	66	.560	.503	8	711	654	81-69	.542
5	Washington Nationals	.516	86	63	.577	.495	3	640	520	90-59	.602
6	St. Louis Cardinals	.514	83	67	.553	.500	6	578	568	76-74	.509
7	Los Angeles Dodgers	.513	86	64	.573	.493	4	637	547	86-64	.576
8	Kansas City Royals	.512	82	67	.550	.499	9	597	576	77-72	.518
9	Seattle Mariners	.510	80	69	.537	.502	10	581	488	87-62	.586
10	Toronto Blue Jays	.508	77	72	.517	.505	13	669	638	78-71	.524
11	Pittsburgh Pirates	.506	79	70	.530	.498	11	635	601	79-70	.527
12	New York Yankees	.505	76	73	.510	.504	15	577	607	71-78	.475
13	Cleveland Indians	.503	76	73	.510	.501	12	624	620	75-74	.503
14	Tampa Bay Rays	.503	73	78	.483	.509	17	579	574	76-75	.504
15	San Francisco Giants	.503	82	68	.547	.488	5	625	564	83-67	.551
16	Milwaukee Brewers	.501	78	72	.520	.494	14	625	625	75-75	.500
17	Atlanta Braves	.498	75	75	.500	.497	16	547	550	75-75	.497
18	Houston Astros	.495	67	83	.447	.511	24	591	679	65-85	.431
19	New York Mets	.493	72	79	.477	.499	18	578	591	74-77	.489
20	Cincinnati Reds	.492	71	80	.470	.500	20	559	571	74-77	.489
21	Miami Marlins	.492	73	76	.490	.493	19	608	625	72-77	.486
22	Boston Red Sox	.491	66	84	.440	.508	26	580	661	65-85	.435
23	Philadelphia Phillies	.490	69	81	.460	.500	22	583	643	68-82	.451
24	Chicago White Sox	.489	68	82	.453	.500	23	617	707	65-85	.432
25	Minnesota Twins	.484	63	87	.420	.506	27	658	728	67-83	.450
26	San Diego Padres	.483	69	80	.463	.489	21	482	533	67-82	.450
27	Chicago Cubs	.482	66	84	.440	.496	25	563	649	64-86	.429
28	Texas Rangers	.476	57	92	.383	.507	30	579	735	57-92	.383
29	Arizona Diamondbacks	.473	62	88	.413	.493	28	578	681	63-87	.419
30	Colorado Rockies	.468	59	91	.393	.493	29	674	769	65-85	.434

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.