2017 MLB Relative Power Index (RPI),as of the games of June 25,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.554	52	25	.675	.513	0	424	305	51-26	.659
2	Los Angeles Dodgers	.538	51	26	.662	.496	0	406	268	54-23	.697
3	Colorado Rockies	.533	47	31	.603	.510	0	402	359	43-35	.556
4	Arizona Diamondbacks	.528	48	28	.632	.493	0	400	291	50-26	.654
5	Cleveland Indians	.519	39	35	.527	.516	0	345	300	42-32	.569
6	New York Yankees	.515	40	33	.548	.504	0	408	313	46-27	.630
7	Seattle Mariners	.511	39	39	.500	.515	0	382	383	39-39	.499
8	Minnesota Twins	.510	39	34	.534	.502	0	338	376	33-40	.447
9	Texas Rangers	.509	38	37	.507	.510	0	375	346	41-34	.540
10	Los Angeles Angels	.509	40	39	.506	.510	0	345	342	40-39	.504
11	Baltimore Orioles	.508	37	38	.493	.512	0	344	409	31-44	.414
12	Boston Red Sox	.508	41	34	.547	.495	0	350	320	41-34	.545
13	Kansas City Royals	.505	37	37	.500	.507	0	292	330	32-42	.439
14	Washington Nationals	.505	45	30	.600	.473	0	424	336	46-29	.614
15	Tampa Bay Rays	.505	40	38	.513	.502	0	383	362	41-37	.528
16	Oakland Athletics	.500	34	42	.447	.518	0	331	403	31-45	.403
17	Milwaukee Brewers	.498	41	37	.526	.489	0	371	358	40-38	.518
18	Toronto Blue Jays	.495	36	39	.480	.500	0	324	346	35-40	.467
19	Chicago Cubs	.493	38	37	.507	.489	0	350	326	40-35	.535
20	Detroit Tigers	.490	33	42	.440	.506	0	357	379	35-40	.470
21	Pittsburgh Pirates	.489	35	41	.461	.499	0	324	357	34-42	.452
22	San Diego Padres	.488	31	45	.408	.514	0	274	388	25-51	.333
23	Miami Marlins	.487	34	40	.459	.496	0	341	359	35-39	.474
24	Chicago White Sox	.483	32	42	.432	.500	0	337	341	37-37	.494
25	St. Louis Cardinals	.482	34	40	.459	.489	0	322	335	36-38	.480
26	New York Mets	.477	34	41	.453	.485	0	366	403	34-41	.452
27	Atlanta Braves	.471	36	39	.480	.468	0	352	386	34-41	.454
28	Cincinnati Reds	.469	31	43	.419	.486	0	363	405	33-41	.445
29	San Francisco Giants	.467	27	51	.346	.508	0	293	400	27-51	.349
30	Philadelphia Phillies	.456	24	50	.324	.499	0	284	381	26-48	.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.