2017 MLB Relative Power Index (RPI),as of the games of May 12,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Baltimore Orioles	.568	22	12	.647	.541	0	151	139	18-16	.541
2	New York Yankees	.560	21	12	.636	.534	0	183	132	22-11	.658
3	Houston Astros	.547	25	11	.694	.497	0	173	128	23-13	.646
4	Colorado Rockies	.541	23	14	.622	.514	0	178	170	19-18	.523
5	Washington Nationals	.535	22	12	.647	.497	0	209	158	22-12	.636
6	Boston Red Sox	.531	18	17	.514	.537	0	157	145	19-16	.540
7	St. Louis Cardinals	.520	19	15	.559	.506	0	155	143	18-16	.540
8	Milwaukee Brewers	.519	19	17	.528	.516	0	181	166	20-16	.543
9	Chicago Cubs	.517	18	17	.514	.518	0	169	160	18-17	.527
10	Arizona Diamondbacks	.515	21	16	.568	.498	0	182	151	22-15	.592
11	Los Angeles Dodgers	.510	21	15	.583	.486	0	181	127	24-12	.670
12	Cincinnati Reds	.509	19	16	.543	.498	0	177	159	19-16	.553
13	Detroit Tigers	.508	17	17	.500	.511	0	165	173	16-18	.476
14	Cleveland Indians	.508	18	16	.529	.501	0	143	132	18-16	.540
15	Minnesota Twins	.506	18	14	.563	.487	0	148	149	16-16	.497
16	Chicago White Sox	.500	15	18	.455	.515	0	132	132	17-17	.500
17	Tampa Bay Rays	.495	18	20	.474	.502	0	166	159	20-18	.522
18	Toronto Blue Jays	.495	15	21	.417	.521	0	141	158	16-20	.443
19	Seattle Mariners	.494	17	19	.472	.501	0	178	172	19-17	.517
20	Los Angeles Angels	.492	18	20	.474	.498	0	144	162	17-21	.441
21	Philadelphia Phillies	.483	13	19	.406	.508	0	152	156	16-16	.487
22	Oakland Athletics	.482	16	19	.457	.491	0	131	171	13-22	.370
23	Texas Rangers	.477	17	20	.459	.483	0	168	159	20-17	.528
24	Pittsburgh Pirates	.477	14	22	.389	.506	0	128	169	13-23	.365
25	San Francisco Giants	.464	13	24	.351	.501	0	120	188	11-26	.289
26	Kansas City Royals	.462	14	21	.400	.483	0	106	144	12-23	.351
27	San Diego Padres	.455	14	23	.378	.480	0	133	191	12-25	.327
28	Atlanta Braves	.446	12	20	.375	.469	0	143	174	13-19	.403
29	Miami Marlins	.442	13	21	.382	.462	0	153	170	15-19	.448
30	New York Mets	.439	16	18	.471	.428	0	171	181	16-18	.472

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.