2017 MLB Relative Power Index (RPI),as of the games of July 8,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.547	59	29	.670	.505	0	508	364	58-30	.661
2	Los Angeles Dodgers	.545	60	29	.674	.502	0	458	298	63-26	.703
3	Arizona Diamondbacks	.527	53	35	.602	.502	0	445	342	55-33	.629
4	Colorado Rockies	.523	51	39	.567	.508	0	451	419	48-42	.537
5	Cleveland Indians	.518	47	39	.547	.508	0	418	342	52-34	.599
6	Boston Red Sox	.512	50	38	.568	.493	0	428	361	51-37	.584
7	New York Yankees	.509	45	40	.529	.502	0	474	374	52-33	.616
8	Kansas City Royals	.507	44	42	.512	.506	0	360	382	40-46	.470
9	Minnesota Twins	.507	45	42	.517	.504	0	398	452	38-49	.437
10	Milwaukee Brewers	.507	49	41	.544	.495	0	446	403	50-40	.551
11	Washington Nationals	.504	51	36	.586	.477	0	476	391	52-35	.597
12	Tampa Bay Rays	.503	46	43	.517	.499	0	423	409	46-43	.517
13	Baltimore Orioles	.503	41	46	.471	.513	0	381	465	35-52	.402
14	Los Angeles Angels	.503	44	47	.484	.509	0	374	399	43-48	.468
15	Texas Rangers	.502	43	44	.494	.504	0	444	412	47-40	.537
16	Chicago Cubs	.496	43	44	.494	.496	0	396	385	45-42	.514
17	Seattle Mariners	.495	42	47	.472	.503	0	427	435	44-45	.491
18	Oakland Athletics	.494	39	49	.443	.511	0	382	466	35-53	.402
19	San Diego Padres	.494	38	49	.437	.513	0	311	433	30-57	.340
20	Toronto Blue Jays	.494	41	46	.471	.502	0	365	411	38-49	.441
21	St. Louis Cardinals	.494	42	45	.483	.498	0	396	389	44-43	.509
22	Detroit Tigers	.488	38	48	.442	.503	0	404	437	40-46	.461
23	Pittsburgh Pirates	.487	41	47	.466	.494	0	364	400	40-48	.453
24	Miami Marlins	.486	40	46	.465	.493	0	400	421	41-45	.474
25	Chicago White Sox	.484	38	48	.442	.498	0	397	419	41-45	.473
26	Cincinnati Reds	.482	38	49	.437	.497	0	422	462	40-47	.455
27	Atlanta Braves	.482	42	44	.488	.480	0	400	439	39-47	.454
28	New York Mets	.479	39	46	.459	.485	0	406	449	38-47	.450
29	San Francisco Giants	.477	34	55	.382	.509	0	346	443	34-55	.379
30	Philadelphia Phillies	.454	28	58	.326	.496	0	325	423	32-54	.371

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.