2017 MLB Relative Power Index (RPI),as of the games of July 30,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Dodgers	.550	74	31	.705	.498	0	535	350	74-31	.700
2	Houston Astros	.539	68	36	.654	.500	0	609	448	67-37	.649
3	Colorado Rockies	.522	60	46	.566	.507	0	564	514	58-48	.546
4	Arizona Diamondbacks	.519	60	45	.571	.502	0	528	404	66-39	.631
5	Washington Nationals	.517	62	41	.602	.488	0	574	459	63-40	.610
6	New York Yankees	.511	56	47	.544	.499	0	550	435	63-40	.615
7	Cleveland Indians	.508	57	46	.553	.493	0	504	403	63-40	.610
8	Chicago Cubs	.507	56	48	.538	.497	0	484	448	56-48	.539
9	Kansas City Royals	.507	55	48	.534	.497	0	454	454	52-52	.500
10	Boston Red Sox	.505	57	49	.538	.494	0	493	433	60-46	.565
11	Los Angeles Angels	.502	51	55	.481	.509	0	442	466	50-56	.474
12	St. Louis Cardinals	.502	52	53	.495	.504	0	469	445	55-50	.526
13	Seattle Mariners	.501	53	53	.500	.501	0	500	499	53-53	.501
14	Baltimore Orioles	.501	50	54	.481	.508	0	483	555	45-59	.431
15	Tampa Bay Rays	.500	54	52	.509	.497	0	484	476	54-52	.508
16	Minnesota Twins	.500	50	53	.485	.504	0	469	541	44-59	.429
17	Milwaukee Brewers	.498	55	52	.514	.492	0	507	484	56-51	.523
18	Texas Rangers	.497	50	54	.481	.502	0	512	513	52-52	.499
19	Pittsburgh Pirates	.495	51	54	.486	.498	0	446	470	50-55	.474
20	Toronto Blue Jays	.491	49	56	.467	.499	0	438	523	43-62	.412
21	Miami Marlins	.491	49	54	.476	.496	0	491	510	50-53	.481
22	San Diego Padres	.490	47	58	.448	.504	0	400	533	38-67	.360
23	Detroit Tigers	.489	47	56	.456	.500	0	503	527	49-54	.477
24	Oakland Athletics	.488	46	59	.438	.505	0	447	534	43-62	.412
25	Atlanta Braves	.487	48	55	.466	.493	0	474	531	46-57	.443
26	New York Mets	.486	48	55	.466	.492	0	490	540	47-56	.452
27	Cincinnati Reds	.479	42	63	.400	.506	0	478	576	43-62	.408
28	San Francisco Giants	.477	40	66	.377	.510	0	414	530	40-66	.379
29	Chicago White Sox	.474	40	62	.392	.501	0	442	510	44-58	.429
30	Philadelphia Phillies	.471	38	64	.373	.504	0	414	487	43-59	.420

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.