2017 MLB Relative Power Index (RPI),as of the games of May 6,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Baltimore Orioles	.576	19	10	.655	.549	0	128	121	15-14	.528
2	New York Yankees	.576	19	9	.679	.541	0	162	111	19-9	.681
3	Washington Nationals	.552	21	9	.700	.503	0	189	135	20-10	.662
4	Boston Red Sox	.548	16	14	.533	.553	0	121	115	16-14	.525
5	Colorado Rockies	.529	19	12	.613	.501	0	147	143	16-15	.514
6	Detroit Tigers	.524	15	14	.517	.526	0	144	147	14-15	.490
7	Houston Astros	.523	20	11	.645	.483	0	148	117	19-12	.615
8	Cleveland Indians	.519	16	13	.552	.509	0	127	119	15-14	.532
9	St. Louis Cardinals	.517	15	14	.517	.517	0	125	122	15-14	.512
10	Chicago White Sox	.517	15	14	.517	.517	0	121	108	16-13	.557
11	Chicago Cubs	.517	16	14	.533	.511	0	150	139	16-14	.538
12	Arizona Diamondbacks	.512	18	14	.563	.495	0	157	133	19-13	.582
13	Cincinnati Reds	.510	16	14	.533	.503	0	159	141	17-13	.560
14	Tampa Bay Rays	.508	16	16	.500	.511	0	139	132	17-15	.526
15	Milwaukee Brewers	.507	15	16	.484	.514	0	149	145	16-15	.514
16	Minnesota Twins	.497	15	13	.536	.485	0	127	124	14-14	.512
17	Pittsburgh Pirates	.497	14	16	.467	.506	0	115	129	13-17	.443
18	Los Angeles Dodgers	.496	17	14	.548	.478	0	147	109	20-11	.645
19	Philadelphia Phillies	.494	12	17	.414	.521	0	131	130	15-14	.504
20	Seattle Mariners	.483	14	17	.452	.493	0	151	143	16-15	.527
21	Toronto Blue Jays	.479	10	20	.333	.528	0	116	140	12-18	.407
22	Los Angeles Angels	.473	16	16	.500	.464	0	123	141	14-18	.432
23	New York Mets	.465	14	15	.483	.459	0	152	157	14-15	.484
24	Oakland Athletics	.463	13	17	.433	.473	0	112	150	11-19	.358
25	Miami Marlins	.460	12	17	.414	.476	0	128	140	13-16	.455
26	Texas Rangers	.460	13	18	.419	.473	0	139	143	15-16	.486
27	San Francisco Giants	.457	11	20	.355	.491	0	105	164	9-22	.291
28	Atlanta Braves	.453	11	17	.393	.473	0	126	152	11-17	.407
29	San Diego Padres	.452	12	20	.375	.477	0	117	167	11-21	.329
30	Kansas City Royals	.439	10	19	.345	.471	0	82	120	9-20	.318

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.