2017 MLB Relative Power Index (RPI),as of the games of July 27,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Dodgers	.549	71	31	.696	.500	0	524	343	71-31	.700
2	Houston Astros	.541	67	34	.663	.500	0	599	425	67-34	.665
3	Arizona Diamondbacks	.521	59	43	.578	.501	0	519	399	64-38	.629
4	Colorado Rockies	.520	58	45	.563	.506	0	549	503	56-47	.544
5	Washington Nationals	.517	61	39	.610	.486	0	563	444	62-38	.617
6	New York Yankees	.509	54	46	.540	.499	0	536	425	61-39	.614
7	Cleveland Indians	.508	55	45	.550	.495	0	489	393	61-39	.608
8	Boston Red Sox	.506	56	47	.544	.493	0	479	416	59-44	.570
9	Chicago Cubs	.506	54	47	.535	.496	0	477	443	54-47	.537
10	Kansas City Royals	.505	53	47	.530	.496	0	437	440	50-50	.497
11	Los Angeles Angels	.501	49	54	.476	.510	0	419	448	48-55	.467
12	Minnesota Twins	.501	49	51	.490	.505	0	454	527	43-57	.426
13	Baltimore Orioles	.501	48	53	.475	.509	0	467	541	43-58	.427
14	Tampa Bay Rays	.500	53	50	.515	.496	0	474	462	53-50	.513
15	Seattle Mariners	.500	51	52	.495	.502	0	483	489	51-52	.494
16	St. Louis Cardinals	.499	50	52	.490	.502	0	464	436	54-48	.531
17	Milwaukee Brewers	.499	54	50	.519	.492	0	502	477	55-49	.526
18	Texas Rangers	.498	49	52	.485	.503	0	498	497	51-50	.501
19	Pittsburgh Pirates	.497	50	52	.490	.499	0	435	462	48-54	.470
20	Atlanta Braves	.494	48	52	.480	.498	0	467	515	45-55	.451
21	Toronto Blue Jays	.492	48	54	.471	.499	0	420	500	42-60	.414
22	Miami Marlins	.491	47	53	.470	.498	0	473	497	48-52	.475
23	San Diego Padres	.489	45	57	.441	.505	0	392	522	37-65	.361
24	Oakland Athletics	.488	44	58	.431	.506	0	433	519	42-60	.410
25	New York Mets	.487	47	53	.470	.492	0	480	523	46-54	.457
26	Detroit Tigers	.485	45	55	.450	.497	0	480	517	46-54	.463
27	Cincinnati Reds	.480	41	61	.402	.506	0	465	558	42-60	.410
28	San Francisco Giants	.476	40	63	.388	.505	0	407	519	39-64	.381
29	Chicago White Sox	.473	39	60	.394	.499	0	432	495	43-56	.432
30	Philadelphia Phillies	.467	35	64	.354	.505	0	398	480	40-59	.407

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.