2017 MLB Relative Power Index (RPI),as of the games of May 13,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Baltimore Orioles	.563	22	13	.629	.542	0	154	143	19-16	.537
2	New York Yankees	.559	21	12	.636	.533	0	183	132	22-11	.658
3	Houston Astros	.543	25	11	.694	.493	0	173	128	23-13	.646
4	Colorado Rockies	.538	23	15	.605	.515	0	178	174	19-19	.511
5	Boston Red Sox	.534	19	17	.528	.536	0	163	148	20-16	.548
6	Washington Nationals	.533	23	12	.657	.491	0	215	162	22-13	.638
7	St. Louis Cardinals	.524	20	15	.571	.509	0	160	146	19-16	.546
8	Milwaukee Brewers	.521	20	17	.541	.515	0	192	170	21-16	.561
9	Chicago Cubs	.516	18	18	.500	.522	0	172	165	19-17	.521
10	Minnesota Twins	.516	19	14	.576	.496	0	152	150	17-16	.507
11	Los Angeles Dodgers	.514	22	15	.595	.487	0	185	127	25-12	.680
12	Detroit Tigers	.512	18	17	.514	.511	0	169	176	17-18	.480
13	Arizona Diamondbacks	.511	21	17	.553	.497	0	185	155	22-16	.588
14	Cleveland Indians	.510	18	17	.514	.508	0	144	136	18-17	.529
15	Cincinnati Reds	.506	19	17	.528	.499	0	178	162	20-16	.547
16	Chicago White Sox	.506	16	18	.471	.517	0	137	136	17-17	.504
17	Toronto Blue Jays	.496	16	21	.432	.517	0	148	160	17-20	.461
18	Tampa Bay Rays	.495	18	21	.462	.506	0	169	165	20-19	.512
19	Los Angeles Angels	.488	18	21	.462	.496	0	147	166	17-22	.440
20	Seattle Mariners	.487	17	20	.459	.496	0	180	179	19-18	.503
21	Pittsburgh Pirates	.481	15	22	.405	.506	0	132	172	14-23	.371
22	Philadelphia Phillies	.479	13	20	.394	.508	0	156	162	16-17	.481
23	Texas Rangers	.478	18	20	.474	.480	0	174	164	20-18	.530
24	Oakland Athletics	.477	16	20	.444	.488	0	136	177	13-23	.371
25	Kansas City Royals	.472	15	21	.417	.491	0	110	147	13-23	.359
26	San Francisco Giants	.465	14	24	.368	.498	0	123	189	11-27	.298
27	San Diego Padres	.453	14	24	.368	.481	0	137	196	12-26	.328
28	Atlanta Braves	.449	13	20	.394	.467	0	146	175	14-19	.410
29	New York Mets	.438	16	19	.457	.431	0	175	192	16-19	.454
30	Miami Marlins	.435	13	22	.371	.456	0	154	173	15-20	.442

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.