2017 MLB Relative Power Index (RPI),as of the games of June 29,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.551	54	26	.675	.510	0	445	320	53-27	.659
2	Los Angeles Dodgers	.537	53	28	.654	.498	0	418	277	56-25	.695
3	Arizona Diamondbacks	.526	50	30	.625	.493	0	419	311	52-28	.645
4	Colorado Rockies	.525	47	34	.580	.506	0	410	377	44-37	.542
5	Cleveland Indians	.519	42	36	.538	.513	0	371	315	45-33	.581
6	New York Yankees	.513	42	35	.545	.502	0	432	329	49-28	.633
7	Boston Red Sox	.512	44	35	.557	.497	0	370	330	44-35	.557
8	Los Angeles Angels	.510	42	41	.506	.512	0	354	354	42-42	.500
9	Baltimore Orioles	.510	39	39	.500	.514	0	349	414	32-46	.415
10	Minnesota Twins	.507	40	37	.519	.503	0	348	396	34-43	.436
11	Washington Nationals	.506	47	32	.595	.476	0	446	351	49-30	.618
12	Texas Rangers	.504	39	40	.494	.508	0	390	372	41-38	.524
13	Seattle Mariners	.503	39	41	.488	.508	0	388	396	39-41	.490
14	Kansas City Royals	.502	38	39	.494	.505	0	306	344	34-43	.442
15	Tampa Bay Rays	.502	41	40	.506	.500	0	389	374	42-39	.520
16	Oakland Athletics	.499	35	44	.443	.518	0	346	424	32-47	.400
17	Milwaukee Brewers	.498	42	39	.519	.491	0	391	373	42-39	.524
18	Chicago Cubs	.497	40	39	.506	.494	0	365	348	41-38	.524
19	Pittsburgh Pirates	.492	37	42	.468	.499	0	336	363	36-43	.461
20	Toronto Blue Jays	.491	37	41	.474	.497	0	329	351	36-42	.468
21	Detroit Tigers	.491	35	43	.449	.505	0	371	393	37-41	.471
22	St. Louis Cardinals	.489	37	41	.474	.493	0	349	350	39-39	.499
23	San Diego Padres	.487	33	46	.418	.510	0	287	395	27-52	.346
24	Chicago White Sox	.485	34	44	.436	.501	0	353	365	38-40	.483
25	Miami Marlins	.485	35	42	.455	.495	0	350	376	36-41	.464
26	New York Mets	.479	36	42	.462	.485	0	383	412	36-42	.464
27	San Francisco Giants	.474	30	51	.370	.508	0	311	408	30-51	.368
28	Cincinnati Reds	.473	33	45	.423	.489	0	380	433	34-44	.435
29	Atlanta Braves	.472	37	41	.474	.471	0	359	399	35-43	.447
30	Philadelphia Phillies	.460	26	51	.338	.501	0	298	393	28-49	.365

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.