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

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Colorado Rockies	.545	32	19	.627	.517	0	259	218	30-21	.585
2	Houston Astros	.541	34	16	.680	.495	0	244	182	32-18	.643
3	New York Yankees	.539	28	18	.609	.516	0	245	191	29-17	.622
4	Baltimore Orioles	.532	25	22	.532	.533	0	209	212	23-24	.493
5	Arizona Diamondbacks	.524	31	20	.608	.496	0	253	198	32-19	.620
6	Boston Red Sox	.523	27	21	.563	.510	0	231	200	27-21	.572
7	Minnesota Twins	.522	26	19	.578	.504	0	204	201	23-22	.507
8	Los Angeles Dodgers	.522	30	20	.600	.496	0	247	174	33-17	.668
9	Chicago Cubs	.516	25	23	.521	.514	0	231	218	25-23	.529
10	Cleveland Indians	.513	24	23	.511	.514	0	202	195	24-23	.518
11	St. Louis Cardinals	.513	24	22	.522	.510	0	199	189	24-22	.526
12	Tampa Bay Rays	.512	26	26	.500	.516	0	235	211	29-23	.554
13	Milwaukee Brewers	.509	26	23	.531	.502	0	248	227	27-22	.544
14	Washington Nationals	.505	30	18	.625	.466	0	271	212	30-18	.620
15	Detroit Tigers	.504	23	26	.469	.516	0	226	246	22-27	.458
16	Toronto Blue Jays	.495	23	26	.469	.503	0	208	216	24-25	.481
17	Chicago White Sox	.493	22	26	.458	.504	0	218	195	27-21	.556
18	Kansas City Royals	.492	21	27	.438	.511	0	164	205	19-29	.390
19	Cincinnati Reds	.492	23	25	.479	.496	0	242	239	24-24	.506
20	Los Angeles Angels	.491	26	26	.500	.488	0	211	220	25-27	.479
21	Pittsburgh Pirates	.490	23	27	.460	.500	0	201	231	22-28	.431
22	San Francisco Giants	.488	21	30	.412	.514	0	172	240	17-34	.339
23	Oakland Athletics	.486	22	26	.458	.495	0	195	235	20-28	.408
24	Texas Rangers	.484	24	26	.480	.486	0	234	226	26-24	.517
25	Seattle Mariners	.478	21	29	.420	.497	0	212	252	21-29	.414
26	San Diego Padres	.468	18	33	.353	.506	0	172	268	15-36	.292
27	Philadelphia Phillies	.467	17	30	.362	.501	0	196	234	19-28	.412
28	Atlanta Braves	.460	21	26	.447	.465	0	213	245	20-27	.430
29	Miami Marlins	.447	17	30	.362	.475	0	200	245	19-28	.400
30	New York Mets	.443	20	27	.426	.449	0	239	256	22-25	.466

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.