2017 MLB Relative Power Index (RPI),as of the games of September 3,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Dodgers	.541	92	44	.676	.496	0	668	466	91-45	.673
2	Houston Astros	.528	83	53	.610	.501	0	759	597	84-52	.618
3	Arizona Diamondbacks	.523	79	58	.577	.505	0	675	551	82-55	.600
4	Cleveland Indians	.521	80	56	.588	.499	0	680	501	88-48	.648
5	Washington Nationals	.517	82	54	.603	.488	0	709	567	83-53	.610
6	Boston Red Sox	.516	77	60	.562	.500	0	649	568	78-59	.566
7	New York Yankees	.512	73	63	.537	.504	0	704	567	82-54	.607
8	Chicago Cubs	.509	75	61	.551	.494	0	692	598	78-58	.572
9	Colorado Rockies	.509	72	64	.529	.502	0	689	653	72-64	.527
10	Baltimore Orioles	.507	70	67	.511	.506	0	668	691	66-71	.483
11	Minnesota Twins	.506	71	65	.522	.501	0	673	673	68-68	.500
12	Los Angeles Angels	.505	70	67	.511	.503	0	606	597	70-67	.507
13	Milwaukee Brewers	.505	72	65	.526	.498	0	620	600	71-66	.516
14	Texas Rangers	.502	68	68	.500	.503	0	693	660	71-65	.524
15	St. Louis Cardinals	.501	69	67	.507	.499	0	650	592	74-62	.547
16	Kansas City Royals	.501	67	68	.496	.502	0	581	652	60-75	.443
17	Tampa Bay Rays	.500	68	70	.493	.502	0	594	598	69-69	.497
18	Seattle Mariners	.500	69	68	.504	.498	0	640	659	66-71	.485
19	Toronto Blue Jays	.493	63	74	.460	.504	0	582	678	58-79	.424
20	San Diego Padres	.491	62	75	.453	.503	0	528	671	52-85	.382
21	Pittsburgh Pirates	.490	65	72	.474	.495	0	571	637	61-76	.446
22	Miami Marlins	.490	67	69	.493	.489	0	634	661	65-71	.479
23	Detroit Tigers	.486	58	78	.426	.506	0	633	726	59-77	.432
24	Oakland Athletics	.484	58	78	.426	.503	0	597	714	56-80	.411
25	Cincinnati Reds	.483	58	79	.423	.503	0	651	749	59-78	.430
26	New York Mets	.480	58	78	.426	.499	0	622	708	59-77	.436
27	Atlanta Braves	.479	60	75	.444	.491	0	619	688	60-75	.447
28	Chicago White Sox	.479	54	81	.400	.506	0	579	687	56-79	.415
29	San Francisco Giants	.474	54	85	.388	.502	0	543	680	54-85	.389
30	Philadelphia Phillies	.467	52	84	.382	.496	0	556	676	55-81	.404

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.