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

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Dodgers	.548	91	38	.705	.495	0	645	426	90-39	.696
2	Houston Astros	.528	79	51	.608	.502	0	727	561	81-49	.627
3	Washington Nationals	.518	79	51	.608	.488	0	689	548	80-50	.613
4	Cleveland Indians	.517	74	56	.569	.499	0	640	491	82-48	.629
5	Arizona Diamondbacks	.516	73	58	.557	.502	0	634	532	77-54	.587
6	Boston Red Sox	.515	74	57	.565	.499	0	630	546	75-56	.571
7	Colorado Rockies	.511	71	60	.542	.501	0	672	624	70-61	.537
8	New York Yankees	.511	70	60	.538	.501	0	678	547	79-51	.606
9	Baltimore Orioles	.506	66	65	.504	.507	0	640	662	63-68	.483
10	Chicago Cubs	.506	70	60	.538	.495	0	648	575	73-57	.559
11	Los Angeles Angels	.506	67	65	.508	.505	0	566	566	66-66	.500
12	Minnesota Twins	.504	67	63	.515	.501	0	624	652	62-68	.478
13	Tampa Bay Rays	.502	66	67	.496	.503	0	578	577	67-66	.501
14	Milwaukee Brewers	.501	68	63	.519	.495	0	596	577	68-63	.516
15	St. Louis Cardinals	.500	65	65	.500	.500	0	611	571	69-61	.534
16	Seattle Mariners	.500	66	66	.500	.499	0	613	637	63-69	.481
17	Kansas City Royals	.499	64	66	.492	.501	0	560	618	59-71	.451
18	Texas Rangers	.498	64	66	.492	.500	0	651	630	67-63	.516
19	Miami Marlins	.496	66	64	.508	.493	0	617	632	63-67	.488
20	Toronto Blue Jays	.494	61	70	.466	.504	0	559	652	55-76	.424
21	Pittsburgh Pirates	.491	63	69	.477	.496	0	556	608	60-72	.455
22	Oakland Athletics	.489	58	73	.443	.504	0	577	676	55-76	.421
23	Detroit Tigers	.487	57	73	.438	.503	0	619	688	58-72	.447
24	San Diego Padres	.485	57	74	.435	.501	0	498	656	48-83	.366
25	New York Mets	.484	57	73	.438	.499	0	599	663	58-72	.449
26	Cincinnati Reds	.483	55	76	.420	.503	0	622	730	55-76	.421
27	Atlanta Braves	.481	57	72	.442	.493	0	586	662	57-72	.439
28	Chicago White Sox	.480	52	77	.403	.505	0	558	656	54-75	.420
29	San Francisco Giants	.477	53	80	.398	.503	0	527	645	53-80	.400
30	Philadelphia Phillies	.467	49	81	.377	.497	0	536	648	53-77	.406

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.