2017 MLB Relative Power Index (RPI),as of the games of May 1,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	New York Yankees	.568	15	9	.625	.549	0	129	92	16-8	.663
2	Baltimore Orioles	.567	16	8	.667	.534	0	106	102	12-12	.519
3	Washington Nationals	.554	17	8	.680	.512	0	170	122	17-8	.660
4	Colorado Rockies	.544	16	10	.615	.520	0	119	125	12-14	.475
5	Cleveland Indians	.535	14	11	.560	.527	0	118	108	14-11	.544
6	Boston Red Sox	.528	13	12	.520	.530	0	95	98	12-13	.484
7	Chicago White Sox	.527	13	11	.542	.523	0	99	89	13-11	.553
8	Detroit Tigers	.526	13	12	.520	.528	0	125	134	12-13	.465
9	Houston Astros	.526	17	9	.654	.483	0	118	91	16-10	.627
10	Arizona Diamondbacks	.511	16	11	.593	.484	0	141	112	17-10	.613
11	Tampa Bay Rays	.511	13	14	.481	.521	0	115	111	14-13	.518
12	Los Angeles Dodgers	.510	14	13	.519	.507	0	115	96	16-11	.589
13	Milwaukee Brewers	.507	14	13	.519	.504	0	142	133	14-13	.533
14	Philadelphia Phillies	.506	12	12	.500	.508	0	116	102	14-10	.564
15	St. Louis Cardinals	.503	12	13	.480	.511	0	104	113	11-14	.459
16	Chicago Cubs	.502	13	12	.520	.496	0	124	114	14-11	.542
17	Minnesota Twins	.498	12	11	.522	.490	0	101	97	12-11	.520
18	Cincinnati Reds	.496	12	13	.480	.502	0	118	120	12-13	.492
19	Seattle Mariners	.485	11	15	.423	.506	0	119	122	13-13	.488
20	Pittsburgh Pirates	.485	11	14	.440	.500	0	93	114	10-15	.400
21	New York Mets	.478	11	14	.440	.491	0	110	133	10-15	.406
22	Miami Marlins	.476	11	13	.458	.482	0	106	107	12-12	.495
23	Toronto Blue Jays	.472	9	17	.346	.514	0	96	111	11-15	.428
24	Los Angeles Angels	.469	14	13	.519	.452	0	99	110	12-15	.448
25	Atlanta Braves	.463	10	14	.417	.478	0	109	114	11-13	.478
26	San Diego Padres	.462	11	16	.407	.480	0	102	133	10-17	.370
27	San Francisco Giants	.462	10	17	.370	.492	0	91	123	10-17	.354
28	Oakland Athletics	.456	11	14	.440	.462	0	91	117	9-16	.377
29	Texas Rangers	.454	11	15	.423	.464	0	116	112	13-13	.518
30	Kansas City Royals	.432	8	16	.333	.465	0	69	101	8-16	.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.