2017 MLB Relative Power Index (RPI),as of the games of July 15,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.546	61	30	.670	.505	0	539	374	61-30	.675
2	Los Angeles Dodgers	.546	63	29	.685	.500	0	476	305	65-27	.709
3	Arizona Diamondbacks	.521	53	38	.582	.501	0	454	356	56-35	.619
4	Colorado Rockies	.519	52	41	.559	.506	0	466	442	49-44	.526
5	Boston Red Sox	.511	51	40	.560	.494	0	437	374	53-38	.577
6	Washington Nationals	.510	54	36	.600	.480	0	501	403	55-35	.607
7	Milwaukee Brewers	.509	52	41	.559	.493	0	463	414	52-41	.556
8	Cleveland Indians	.509	47	42	.528	.503	0	424	357	52-37	.585
9	New York Yankees	.508	46	42	.523	.503	0	485	385	54-34	.613
10	Tampa Bay Rays	.507	49	43	.533	.498	0	436	416	48-44	.523
11	Minnesota Twins	.503	46	44	.511	.500	0	412	475	39-51	.429
12	Texas Rangers	.503	45	45	.500	.504	0	450	418	48-42	.537
13	Los Angeles Angels	.502	45	49	.479	.510	0	381	407	44-50	.467
14	Kansas City Royals	.501	44	45	.494	.503	0	365	393	41-48	.463
15	Baltimore Orioles	.500	42	48	.467	.511	0	403	489	36-54	.404
16	Chicago Cubs	.498	45	45	.500	.498	0	418	410	46-44	.510
17	Seattle Mariners	.498	45	47	.489	.501	0	439	440	46-46	.499
18	St. Louis Cardinals	.497	44	46	.489	.500	0	408	394	47-43	.517
19	Oakland Athletics	.496	41	50	.451	.511	0	392	473	37-54	.407
20	Toronto Blue Jays	.494	42	48	.467	.503	0	374	443	37-53	.416
21	Pittsburgh Pirates	.490	43	48	.473	.496	0	383	409	43-48	.467
22	San Diego Padres	.490	39	51	.433	.509	0	321	448	31-59	.339
23	Miami Marlins	.489	41	48	.461	.499	0	415	442	42-47	.469
24	Atlanta Braves	.488	44	45	.494	.486	0	417	457	40-49	.454
25	Detroit Tigers	.486	40	49	.449	.499	0	422	448	42-47	.470
26	Cincinnati Reds	.484	39	51	.433	.501	0	431	478	40-50	.448
27	New York Mets	.484	41	47	.466	.490	0	429	460	41-47	.465
28	Chicago White Sox	.478	38	51	.427	.495	0	402	437	41-48	.458
29	San Francisco Giants	.475	35	57	.380	.507	0	362	462	35-57	.380
30	Philadelphia Phillies	.456	29	60	.326	.500	0	340	436	34-55	.378

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.