2017 MLB Relative Power Index (RPI),as of the games of April 28,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	New York Yankees	.590	14	7	.667	.564	0	112	74	15-6	.696
2	Washington Nationals	.568	16	7	.696	.526	0	144	112	14-9	.623
3	Baltimore Orioles	.548	14	7	.667	.509	0	90	84	11-10	.534
4	Cleveland Indians	.542	12	10	.545	.541	0	101	94	12-10	.536
5	Colorado Rockies	.542	15	9	.625	.514	0	112	117	11-13	.478
6	Chicago White Sox	.537	12	9	.571	.526	0	89	72	13-8	.604
7	Houston Astros	.535	15	8	.652	.496	0	104	85	14-9	.600
8	Boston Red Sox	.531	12	10	.545	.527	0	83	84	11-11	.494
9	Tampa Bay Rays	.530	12	12	.500	.540	0	109	102	13-11	.533
10	Detroit Tigers	.523	11	11	.500	.531	0	107	124	9-13	.427
11	St. Louis Cardinals	.516	12	11	.522	.514	0	95	101	11-12	.469
12	Philadelphia Phillies	.511	11	10	.524	.506	0	98	89	12-9	.548
13	Chicago Cubs	.508	12	10	.545	.496	0	113	94	13-9	.591
14	Pittsburgh Pirates	.507	10	12	.455	.524	0	83	100	9-13	.408
15	Los Angeles Dodgers	.505	12	12	.500	.507	0	101	84	14-10	.591
16	Milwaukee Brewers	.504	12	12	.500	.505	0	128	114	13-11	.558
17	Arizona Diamondbacks	.497	15	10	.600	.463	0	133	105	15-10	.616
18	Minnesota Twins	.492	11	11	.500	.490	0	94	92	11-11	.511
19	Seattle Mariners	.492	11	13	.458	.503	0	112	106	13-11	.528
20	Cincinnati Reds	.483	10	13	.435	.500	0	109	113	11-12	.482
21	Miami Marlins	.481	10	11	.476	.483	0	94	96	10-11	.489
22	New York Mets	.469	9	13	.409	.489	0	93	102	10-12	.454
23	Los Angeles Angels	.464	13	12	.520	.445	0	91	102	11-14	.443
24	San Francisco Giants	.463	9	15	.375	.493	0	81	103	9-15	.382
25	Atlanta Braves	.462	9	12	.429	.473	0	90	100	9-12	.448
26	San Diego Padres	.449	9	16	.360	.479	0	85	127	8-17	.309
27	Oakland Athletics	.448	10	13	.435	.453	0	87	109	9-14	.389
28	Texas Rangers	.447	10	13	.435	.451	0	106	98	12-11	.539
29	Toronto Blue Jays	.447	6	17	.261	.509	0	82	108	8-15	.366
30	Kansas City Royals	.427	7	15	.318	.464	0	58	93	6-16	.280

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.