2017 MLB Relative Power Index (RPI),as of the games of April 22,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	New York Yankees	.581	11	6	.647	.559	0	91	60	12-5	.697
2	Baltimore Orioles	.571	12	4	.750	.512	0	66	55	9-7	.590
3	Washington Nationals	.544	12	5	.706	.489	0	87	73	10-7	.587
4	Tampa Bay Rays	.531	10	9	.526	.532	0	89	81	10-9	.547
5	Boston Red Sox	.530	10	8	.556	.521	0	71	72	9-9	.493
6	Cleveland Indians	.529	10	7	.588	.509	0	85	72	10-7	.582
7	Detroit Tigers	.529	9	8	.529	.529	0	71	94	6-11	.363
8	Colorado Rockies	.526	12	6	.667	.479	0	72	70	9-9	.514
9	Los Angeles Dodgers	.520	8	10	.444	.546	0	79	71	10-8	.553
10	Houston Astros	.517	12	6	.667	.467	0	76	64	11-7	.585
11	Chicago Cubs	.516	10	7	.588	.492	0	84	73	10-7	.570
12	St. Louis Cardinals	.515	8	10	.444	.539	0	63	78	7-11	.395
13	Cincinnati Reds	.514	9	9	.500	.519	0	85	72	10-8	.582
14	Arizona Diamondbacks	.510	12	7	.632	.469	0	103	77	12-7	.641
15	Chicago White Sox	.507	7	9	.438	.530	0	49	59	7-9	.408
16	Philadelphia Phillies	.506	8	9	.471	.518	0	80	76	9-8	.526
17	Milwaukee Brewers	.502	9	10	.474	.512	0	87	86	10-9	.506
18	Miami Marlins	.499	9	8	.529	.489	0	79	71	9-8	.553
19	Minnesota Twins	.481	8	9	.471	.484	0	70	58	10-7	.593
20	Oakland Athletics	.479	10	8	.556	.453	0	75	77	9-9	.487
21	Pittsburgh Pirates	.478	7	10	.412	.500	0	60	77	6-11	.378
22	San Francisco Giants	.474	6	12	.333	.521	0	69	81	8-10	.421
23	Seattle Mariners	.473	7	12	.368	.508	0	79	84	9-10	.469
24	New York Mets	.472	8	10	.444	.481	0	76	76	9-9	.500
25	Texas Rangers	.468	8	10	.444	.476	0	81	76	10-8	.532
26	Toronto Blue Jays	.459	4	13	.235	.534	0	57	78	6-11	.348
27	Kansas City Royals	.456	7	10	.412	.470	0	44	55	7-10	.390
28	Los Angeles Angels	.452	8	11	.421	.463	0	69	85	8-11	.397
29	San Diego Padres	.452	8	11	.421	.462	0	60	89	6-13	.312
30	Atlanta Braves	.443	6	11	.353	.473	0	63	80	7-10	.383

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.