MLB Relative Power Index (RPI), as of the games of May 3,2014 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Atlanta Braves	.557	17	12	.586	.547	2	98	86	16-13	.565
2	Milwaukee Brewers	.539	21	10	.677	.493	1	121	109	17-14	.552
3	Detroit Tigers	.536	16	9	.640	.502	6	121	99	15-10	.599
4	San Francisco Giants	.536	19	11	.633	.503	10	125	104	18-12	.591
5	Colorado Rockies	.529	19	13	.594	.507	11	185	150	19-13	.603
6	Miami Marlins	.529	15	15	.500	.538	25	144	121	18-12	.586
7	Washington Nationals	.528	17	13	.567	.515	9	133	118	17-13	.560
8	Los Angeles Dodgers	.528	18	13	.581	.510	7	133	123	17-14	.539
9	Philadelphia Phillies	.520	14	14	.500	.526	23	117	129	13-15	.451
10	New York Mets	.519	15	14	.517	.519	13	123	129	14-15	.476
11	San Diego Padres	.518	13	18	.419	.550	26	80	109	11-20	.350
12	Oakland Athletics	.508	18	12	.600	.478	3	152	102	21-9	.690
13	Boston Red Sox	.505	15	16	.484	.512	14	131	136	15-16	.481
14	Texas Rangers	.504	16	14	.533	.494	4	122	142	13-17	.425
15	Los Angeles Angels	.504	15	14	.517	.500	15	156	117	19-10	.640
16	Baltimore Orioles	.497	15	13	.536	.484	12	123	126	14-14	.488
17	New York Yankees	.495	16	13	.552	.476	5	126	138	13-16	.455
18	St. Louis Cardinals	.492	15	16	.484	.495	8	110	100	17-14	.548
19	Chicago White Sox	.491	14	17	.452	.504	18	159	164	15-16	.485
20	Seattle Mariners	.489	13	15	.464	.498	27	114	117	14-14	.487
21	Minnesota Twins	.489	13	15	.464	.497	19	144	145	14-14	.497
22	Cleveland Indians	.481	13	17	.433	.496	22	120	137	13-17	.434
23	Tampa Bay Rays	.476	14	17	.452	.484	20	133	144	14-17	.460
24	Cincinnati Reds	.476	14	16	.467	.479	16	116	100	17-13	.574
25	Kansas City Royals	.472	14	15	.483	.468	17	112	120	14-15	.466
26	Arizona Diamondbacks	.468	11	22	.333	.512	29	123	182	10-23	.314
27	Toronto Blue Jays	.461	13	17	.433	.470	21	140	145	14-16	.482
28	Pittsburgh Pirates	.459	12	18	.400	.478	24	116	126	14-16	.459
29	Houston Astros	.455	10	20	.333	.496	30	101	155	9-21	.298
30	Chicago Cubs	.444	11	17	.393	.461	28	108	113	13-15	.477

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.