2017 MLB Relative Power Index (RPI),as of the games of June 1,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.554	38	16	.704	.505	0	292	202	37-17	.676
2	Baltimore Orioles	.539	28	24	.538	.539	0	236	239	26-26	.494
3	New York Yankees	.538	31	20	.608	.515	0	280	214	32-19	.631
4	Colorado Rockies	.534	34	22	.607	.509	0	282	246	32-24	.568
5	Arizona Diamondbacks	.526	34	22	.607	.499	0	273	218	34-22	.611
6	Los Angeles Dodgers	.520	33	22	.600	.494	0	271	187	37-18	.677
7	Tampa Bay Rays	.518	29	27	.518	.518	0	265	239	31-25	.551
8	Cleveland Indians	.517	28	24	.538	.510	0	235	206	29-23	.565
9	Minnesota Twins	.517	27	23	.540	.510	0	230	251	23-27	.456
10	Boston Red Sox	.516	29	24	.547	.506	0	257	225	30-23	.566
11	St. Louis Cardinals	.509	26	25	.510	.509	0	212	212	26-26	.500
12	Washington Nationals	.505	33	19	.635	.461	0	286	221	33-19	.626
13	Milwaukee Brewers	.504	29	25	.537	.493	0	272	243	30-24	.556
14	Toronto Blue Jays	.502	26	28	.481	.509	0	239	241	27-27	.496
15	Detroit Tigers	.502	25	28	.472	.512	0	245	266	24-29	.459
16	Chicago White Sox	.496	24	28	.462	.507	0	238	219	28-24	.542
17	Seattle Mariners	.495	25	30	.455	.508	0	241	267	25-30	.449
18	Chicago Cubs	.495	25	27	.481	.499	0	240	240	26-26	.500
19	Los Angeles Angels	.492	28	29	.491	.492	0	229	243	27-30	.470
20	Kansas City Royals	.487	22	30	.423	.509	0	178	231	19-33	.373
21	Texas Rangers	.487	26	28	.481	.489	0	259	249	28-26	.520
22	Oakland Athletics	.485	23	30	.434	.502	0	210	267	20-33	.382
23	San Francisco Giants	.484	22	33	.400	.512	0	183	253	19-36	.343
24	Pittsburgh Pirates	.482	24	30	.444	.495	0	212	250	23-31	.418
25	San Diego Padres	.481	22	33	.400	.508	0	190	276	18-37	.322
26	Cincinnati Reds	.478	24	28	.462	.484	0	260	271	25-27	.479
27	Atlanta Braves	.462	22	29	.431	.473	0	224	266	21-30	.415
28	Miami Marlins	.461	21	31	.404	.480	0	232	255	24-28	.453
29	New York Mets	.455	23	29	.442	.460	0	257	273	24-28	.470
30	Philadelphia Phillies	.453	17	34	.333	.493	0	205	263	19-32	.378

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.