2017 MLB Relative Power Index (RPI),as of the games of June 19,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.547	47	24	.662	.509	0	383	274	47-24	.661
2	Colorado Rockies	.536	46	26	.639	.501	0	383	308	44-28	.607
3	Los Angeles Dodgers	.530	45	26	.634	.496	0	358	256	47-24	.662
4	Arizona Diamondbacks	.528	44	26	.629	.495	0	359	270	45-25	.639
5	Cleveland Indians	.523	37	31	.544	.517	0	327	277	40-28	.582
6	New York Yankees	.521	38	29	.567	.506	0	383	275	44-23	.660
7	Baltimore Orioles	.513	34	35	.493	.520	0	313	370	29-40	.417
8	Boston Red Sox	.511	39	31	.557	.496	0	324	297	38-32	.543
9	Tampa Bay Rays	.508	37	36	.507	.508	0	346	333	38-35	.519
10	Minnesota Twins	.505	34	33	.507	.504	0	312	356	29-38	.434
11	Kansas City Royals	.504	34	35	.493	.508	0	273	304	31-38	.446
12	Washington Nationals	.504	42	28	.600	.471	0	385	317	42-28	.596
13	Seattle Mariners	.504	35	37	.486	.509	0	344	352	35-37	.489
14	Texas Rangers	.502	34	35	.493	.505	0	337	325	36-33	.518
15	Milwaukee Brewers	.502	38	34	.528	.493	0	348	338	37-35	.515
16	Los Angeles Angels	.501	36	37	.493	.504	0	309	312	36-37	.495
17	Detroit Tigers	.499	32	37	.464	.511	0	332	345	33-36	.481
18	Toronto Blue Jays	.498	34	35	.493	.500	0	298	314	33-36	.474
19	Chicago Cubs	.497	35	34	.507	.493	0	326	313	36-33	.520
20	Oakland Athletics	.496	31	39	.443	.514	0	299	373	27-43	.391
21	Chicago White Sox	.492	31	37	.456	.504	0	314	310	34-34	.506
22	Pittsburgh Pirates	.489	32	38	.457	.499	0	297	332	31-39	.445
23	San Diego Padres	.487	28	43	.394	.517	0	258	372	23-48	.325
24	St. Louis Cardinals	.486	31	37	.456	.495	0	292	308	32-36	.473
25	Miami Marlins	.480	31	37	.456	.488	0	326	328	34-34	.497
26	San Francisco Giants	.474	26	46	.361	.512	0	265	356	26-46	.357
27	Cincinnati Reds	.472	30	39	.435	.484	0	341	365	32-37	.466
28	New York Mets	.471	31	38	.449	.478	0	337	369	31-38	.455
29	Atlanta Braves	.466	32	37	.464	.466	0	324	354	31-38	.456
30	Philadelphia Phillies	.454	22	46	.324	.497	0	263	353	24-44	.357

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.