2017 MLB Relative Power Index (RPI),as of the games of June 4,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.560	41	16	.719	.506	0	312	210	39-18	.688
2	Baltimore Orioles	.535	29	26	.527	.538	0	244	253	27-28	.482
3	New York Yankees	.531	32	22	.593	.510	0	294	224	34-20	.633
4	Colorado Rockies	.531	36	23	.610	.504	0	300	256	34-25	.579
5	Los Angeles Dodgers	.521	35	23	.603	.493	0	283	199	39-19	.669
6	Boston Red Sox	.518	31	25	.554	.506	0	271	233	32-24	.575
7	Minnesota Twins	.517	29	24	.547	.507	0	246	265	25-28	.463
8	Arizona Diamondbacks	.515	34	25	.576	.494	0	283	234	35-24	.594
9	Cleveland Indians	.511	29	26	.527	.506	0	248	222	31-24	.555
10	Tampa Bay Rays	.511	29	30	.492	.517	0	272	267	30-29	.509
11	Washington Nationals	.508	35	20	.636	.465	0	314	244	34-21	.624
12	Detroit Tigers	.505	28	28	.500	.507	0	277	276	28-28	.502
13	Seattle Mariners	.503	28	30	.483	.510	0	269	274	28-30	.491
14	Milwaukee Brewers	.503	30	27	.526	.495	0	284	255	32-25	.554
15	Toronto Blue Jays	.502	28	29	.491	.506	0	249	255	28-29	.488
16	Chicago Cubs	.502	28	27	.509	.499	0	255	251	28-27	.508
17	St. Louis Cardinals	.502	26	28	.481	.508	0	223	227	27-27	.491
18	Los Angeles Angels	.493	29	31	.483	.497	0	243	259	28-32	.468
19	Chicago White Sox	.489	24	31	.436	.506	0	248	251	27-28	.494
20	Texas Rangers	.488	26	31	.456	.499	0	267	269	28-29	.496
21	Kansas City Royals	.488	24	31	.436	.505	0	194	244	21-34	.387
22	Oakland Athletics	.488	24	32	.429	.508	0	233	295	22-34	.384
23	Pittsburgh Pirates	.483	26	31	.456	.492	0	237	262	26-31	.450
24	San Diego Padres	.480	23	35	.397	.508	0	200	294	18-40	.316
25	San Francisco Giants	.477	23	35	.397	.503	0	203	267	21-37	.366
26	Cincinnati Reds	.475	25	30	.455	.482	0	276	292	26-29	.472
27	Miami Marlins	.474	24	31	.436	.486	0	248	265	26-29	.467
28	Atlanta Braves	.468	24	30	.444	.475	0	245	282	23-31	.430
29	Philadelphia Phillies	.459	19	35	.352	.495	0	219	283	20-34	.375
30	New York Mets	.459	24	31	.436	.467	0	269	298	25-30	.449

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.