2017 MLB Relative Power Index (RPI),as of the games of April 15,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Detroit Tigers	.625	7	4	.636	.621	0	50	62	4-7	.394
2	Minnesota Twins	.617	7	4	.636	.610	0	52	27	9-2	.788
3	New York Yankees	.582	7	4	.636	.565	0	51	37	7-4	.655
4	Chicago White Sox	.579	5	5	.500	.605	0	37	31	6-4	.588
5	Boston Red Sox	.572	6	5	.545	.581	0	46	47	5-6	.489
6	Miami Marlins	.567	6	5	.545	.574	0	55	45	7-4	.599
7	Los Angeles Dodgers	.544	7	5	.583	.531	0	59	34	9-3	.751
8	Colorado Rockies	.544	8	5	.615	.521	0	44	52	5-8	.417
9	Baltimore Orioles	.522	7	3	.700	.462	0	42	39	5-5	.537
10	Cincinnati Reds	.518	8	4	.667	.469	0	60	43	8-4	.661
11	Milwaukee Brewers	.514	6	6	.500	.519	0	55	50	7-5	.548
12	New York Mets	.510	7	5	.583	.486	0	59	49	7-5	.592
13	Kansas City Royals	.505	5	6	.455	.522	0	37	44	5-6	.414
14	Chicago Cubs	.504	6	5	.545	.491	0	46	37	7-4	.607
15	Pittsburgh Pirates	.501	5	6	.455	.517	0	40	56	4-7	.338
16	Houston Astros	.499	8	4	.667	.443	0	55	48	7-5	.568
17	Arizona Diamondbacks	.496	7	5	.583	.466	0	60	57	6-6	.526
18	Philadelphia Phillies	.488	4	7	.364	.529	0	52	53	5-6	.490
19	Tampa Bay Rays	.488	6	6	.500	.484	0	51	52	6-6	.490
20	Cleveland Indians	.488	5	6	.455	.499	0	54	61	5-6	.439
21	San Francisco Giants	.481	5	8	.385	.514	0	56	56	7-7	.500
22	San Diego Padres	.477	5	7	.417	.497	0	39	54	4-8	.343
23	St. Louis Cardinals	.456	3	8	.273	.517	0	39	55	4-7	.335
24	Atlanta Braves	.456	4	6	.400	.474	0	36	46	4-6	.380
25	Washington Nationals	.445	6	5	.545	.412	0	54	58	5-6	.464
26	Oakland Athletics	.436	5	7	.417	.442	0	46	57	5-7	.394
27	Seattle Mariners	.435	4	8	.333	.469	0	45	50	5-7	.448
28	Los Angeles Angels	.418	6	6	.500	.391	0	50	60	5-7	.410
29	Toronto Blue Jays	.399	2	9	.182	.471	0	30	43	4-7	.327
30	Texas Rangers	.392	4	7	.364	.401	0	55	52	6-5	.528

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.