2014 MLB Relative Power Index (RPI),as of the games of September 17,2014 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Angels	.533	95	57	.625	.502	1	744	586	94-58	.617
2	Baltimore Orioles	.530	92	60	.605	.505	2	669	555	90-62	.592
3	Oakland Athletics	.516	83	68	.550	.505	7	689	535	94-57	.624
4	Washington Nationals	.516	87	64	.576	.496	3	644	523	91-60	.603
5	Detroit Tigers	.515	84	68	.553	.502	8	718	666	82-70	.538
6	St. Louis Cardinals	.514	84	68	.553	.501	6	582	571	77-75	.510
7	Kansas City Royals	.512	83	68	.550	.499	9	608	585	78-73	.519
8	Seattle Mariners	.511	81	70	.536	.502	10	594	495	89-62	.590
9	Los Angeles Dodgers	.511	86	66	.566	.492	4	643	573	85-67	.557
10	Pittsburgh Pirates	.508	81	70	.536	.498	11	648	602	81-70	.537
11	Toronto Blue Jays	.506	77	74	.510	.505	13	672	652	78-73	.515
12	New York Yankees	.505	77	74	.510	.503	15	581	615	71-80	.472
13	Cleveland Indians	.504	78	73	.517	.500	12	630	622	76-75	.506
14	San Francisco Giants	.504	84	68	.553	.488	5	631	567	84-68	.553
15	Tampa Bay Rays	.503	74	79	.484	.509	17	587	578	78-75	.508
16	Milwaukee Brewers	.502	79	73	.520	.496	14	628	629	76-76	.499
17	Atlanta Braves	.498	76	76	.500	.498	16	550	554	75-77	.496
18	New York Mets	.493	73	80	.477	.499	18	590	596	76-77	.495
19	Houston Astros	.493	67	85	.441	.510	24	593	685	65-87	.428
20	Miami Marlins	.492	74	77	.490	.493	19	613	637	73-78	.481
21	Cincinnati Reds	.491	71	82	.464	.500	20	560	581	74-79	.482
22	Philadelphia Phillies	.490	70	82	.461	.500	22	592	650	69-83	.453
23	Chicago White Sox	.489	69	83	.454	.501	23	626	718	66-86	.432
24	Boston Red Sox	.489	66	86	.434	.507	26	581	674	65-87	.426
25	Minnesota Twins	.487	65	87	.428	.507	27	670	735	69-83	.454
26	Chicago Cubs	.484	68	84	.447	.496	25	573	650	66-86	.437
27	San Diego Padres	.483	70	81	.464	.489	21	489	542	68-83	.449
28	Texas Rangers	.478	59	92	.391	.507	30	591	739	59-92	.390
29	Arizona Diamondbacks	.472	62	90	.408	.494	28	581	687	63-89	.417
30	Colorado Rockies	.471	61	91	.401	.494	29	700	775	68-84	.449

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.