2017 MLB Relative Power Index (RPI),as of the games of May 19,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.552	29	13	.690	.505	0	214	155	28-14	.656
2	Colorado Rockies	.549	27	16	.628	.523	0	211	192	24-19	.547
3	New York Yankees	.545	24	15	.615	.522	0	224	166	25-14	.645
4	Baltimore Orioles	.538	24	16	.600	.517	0	189	177	21-19	.533
5	Boston Red Sox	.522	21	20	.512	.525	0	181	177	21-20	.511
6	Chicago Cubs	.517	21	20	.512	.518	0	200	191	21-20	.523
7	Arizona Diamondbacks	.517	25	18	.581	.495	0	216	173	26-17	.609
8	Milwaukee Brewers	.516	25	18	.581	.495	0	227	193	25-18	.580
9	Cleveland Indians	.516	21	19	.525	.513	0	173	162	21-19	.533
10	Minnesota Twins	.515	21	17	.553	.502	0	165	173	18-20	.476
11	Los Angeles Dodgers	.513	25	18	.581	.490	0	216	151	29-14	.672
12	Detroit Tigers	.512	20	20	.500	.516	0	195	207	19-21	.470
13	St. Louis Cardinals	.512	21	18	.538	.503	0	177	163	21-18	.541
14	Washington Nationals	.507	25	16	.610	.473	0	241	198	24-17	.597
15	Los Angeles Angels	.504	22	22	.500	.505	0	175	187	21-23	.467
16	Tampa Bay Rays	.502	22	22	.500	.503	0	205	187	24-20	.546
17	Texas Rangers	.500	23	20	.535	.489	0	207	179	25-18	.572
18	Oakland Athletics	.493	19	23	.452	.507	0	165	204	17-25	.395
19	Cincinnati Reds	.492	19	22	.463	.501	0	202	207	20-21	.488
20	Seattle Mariners	.491	20	23	.465	.500	0	204	202	22-21	.505
21	Chicago White Sox	.490	18	22	.450	.503	0	169	169	20-20	.500
22	Toronto Blue Jays	.488	18	25	.419	.511	0	178	194	20-23	.457
23	Pittsburgh Pirates	.485	18	24	.429	.503	0	160	196	17-25	.400
24	Kansas City Royals	.484	17	24	.415	.507	0	135	178	15-26	.365
25	San Francisco Giants	.484	18	25	.419	.505	0	148	208	14-29	.336
26	Philadelphia Phillies	.466	15	24	.385	.493	0	180	195	18-21	.460
27	San Diego Padres	.462	15	29	.341	.502	0	152	233	13-31	.299
28	Atlanta Braves	.451	17	22	.436	.456	0	181	206	17-22	.436
29	New York Mets	.437	17	23	.425	.441	0	198	220	18-22	.448
30	Miami Marlins	.436	14	27	.341	.467	0	165	210	16-25	.382

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.