2017 MLB Relative Power Index (RPI),as of the games of June 23,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.549	50	25	.667	.510	0	411	301	49-26	.651
2	Colorado Rockies	.536	47	29	.618	.508	0	396	343	43-33	.571
3	Los Angeles Dodgers	.534	49	26	.653	.494	0	390	262	52-23	.689
4	Arizona Diamondbacks	.528	46	28	.622	.497	0	389	288	48-26	.646
5	Cleveland Indians	.522	39	33	.542	.515	0	343	292	42-30	.580
6	New York Yankees	.518	40	31	.563	.503	0	401	298	46-25	.644
7	Seattle Mariners	.511	39	37	.513	.510	0	378	370	39-37	.511
8	Boston Red Sox	.511	41	32	.562	.494	0	345	310	40-33	.553
9	Tampa Bay Rays	.509	40	36	.526	.503	0	375	346	41-35	.540
10	Minnesota Twins	.508	37	34	.521	.504	0	330	374	31-40	.438
11	Baltimore Orioles	.508	35	38	.479	.517	0	328	401	29-44	.401
12	Kansas City Royals	.506	36	36	.500	.508	0	287	320	32-40	.446
13	Washington Nationals	.505	44	29	.603	.473	0	404	327	44-29	.604
14	Texas Rangers	.504	36	37	.493	.508	0	360	339	39-34	.530
15	Los Angeles Angels	.504	38	39	.494	.508	0	335	337	38-39	.497
16	Milwaukee Brewers	.499	40	36	.526	.489	0	363	355	39-37	.511
17	Oakland Athletics	.497	32	42	.432	.518	0	316	398	29-45	.387
18	Toronto Blue Jays	.496	35	38	.479	.502	0	314	341	33-40	.459
19	Chicago Cubs	.494	37	36	.507	.490	0	343	319	39-34	.536
20	Detroit Tigers	.492	32	41	.438	.509	0	347	367	34-39	.472
21	Pittsburgh Pirates	.489	34	40	.459	.499	0	313	346	33-41	.450
22	San Diego Padres	.488	30	44	.405	.515	0	262	378	24-50	.325
23	Chicago White Sox	.487	32	40	.444	.501	0	332	326	37-35	.509
24	Miami Marlins	.485	33	39	.458	.493	0	334	352	34-38	.474
25	St. Louis Cardinals	.482	33	39	.458	.490	0	311	324	35-37	.480
26	New York Mets	.474	32	41	.438	.486	0	353	399	32-41	.439
27	San Francisco Giants	.470	27	49	.355	.509	0	289	387	27-49	.358
28	Atlanta Braves	.469	35	38	.479	.465	0	349	378	34-39	.460
29	Cincinnati Reds	.468	30	42	.417	.486	0	354	385	33-39	.458
30	Philadelphia Phillies	.456	24	48	.333	.497	0	281	370	26-46	.366

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.