2017 MLB Relative Power Index (RPI),as of the games of June 11,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.552	44	20	.688	.506	0	350	252	42-22	.659
2	New York Yankees	.541	37	23	.617	.515	0	353	238	41-19	.687
3	Colorado Rockies	.536	41	24	.631	.504	0	342	272	40-25	.613
4	Baltimore Orioles	.529	31	30	.508	.536	0	268	308	26-35	.431
5	Los Angeles Dodgers	.525	39	25	.609	.496	0	309	219	43-21	.666
6	Arizona Diamondbacks	.519	39	26	.600	.493	0	335	254	41-24	.635
7	Boston Red Sox	.516	34	28	.548	.506	0	296	268	34-28	.550
8	Tampa Bay Rays	.514	34	32	.515	.514	0	310	297	34-32	.521
9	Minnesota Twins	.512	32	27	.542	.502	0	271	299	27-32	.451
10	Cleveland Indians	.509	31	29	.517	.506	0	266	251	32-28	.529
11	Washington Nationals	.506	38	24	.613	.471	0	333	266	38-24	.610
12	Toronto Blue Jays	.504	31	32	.492	.508	0	270	275	31-32	.491
13	Los Angeles Angels	.503	33	33	.500	.505	0	281	283	33-33	.496
14	Seattle Mariners	.503	31	33	.484	.509	0	294	294	32-32	.500
15	Milwaukee Brewers	.501	33	31	.516	.496	0	313	296	34-30	.528
16	Chicago Cubs	.501	31	31	.500	.501	0	285	283	31-31	.504
17	Detroit Tigers	.500	30	32	.484	.506	0	302	311	30-32	.485
18	Kansas City Royals	.497	28	34	.452	.512	0	237	284	25-37	.411
19	Texas Rangers	.496	30	32	.484	.500	0	296	287	32-30	.515
20	St. Louis Cardinals	.491	29	32	.475	.497	0	248	262	29-32	.473
21	Oakland Athletics	.491	27	36	.429	.512	0	267	332	25-38	.393
22	Chicago White Sox	.485	26	35	.426	.505	0	268	277	29-32	.483
23	Cincinnati Reds	.482	29	33	.468	.486	0	317	322	31-31	.492
24	San Francisco Giants	.481	26	39	.400	.508	0	239	300	25-40	.388
25	Pittsburgh Pirates	.481	28	35	.444	.493	0	266	303	27-36	.435
26	San Diego Padres	.477	24	40	.375	.511	0	224	349	19-45	.292
27	Miami Marlins	.473	27	35	.435	.485	0	283	301	29-33	.469
28	New York Mets	.462	28	33	.459	.463	0	299	317	29-32	.471
29	Atlanta Braves	.456	27	35	.435	.462	0	273	316	26-36	.427
30	Philadelphia Phillies	.455	21	40	.344	.492	0	242	321	22-39	.362

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.