2014 MLB Relative Power Index (RPI),as of the games of August 20,2014 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Angels	.527	75	50	.600	.503	1	590	495	73-52	.587
2	Baltimore Orioles	.527	73	52	.584	.508	5	540	475	70-55	.564
3	Oakland Athletics	.524	74	52	.587	.503	2	608	446	82-44	.650
4	Kansas City Royals	.518	70	56	.556	.506	6	522	491	67-59	.531
5	Detroit Tigers	.515	68	56	.548	.504	8	570	528	67-57	.538
6	Washington Nationals	.514	72	53	.576	.494	3	530	429	76-49	.604
7	St. Louis Cardinals	.514	69	57	.548	.503	10	479	481	63-63	.498
8	Seattle Mariners	.513	68	58	.540	.504	9	499	401	77-49	.608
9	Milwaukee Brewers	.510	71	56	.559	.493	7	550	505	69-58	.543
10	Los Angeles Dodgers	.508	71	57	.555	.493	4	522	473	70-58	.549
11	Toronto Blue Jays	.508	65	62	.512	.507	13	568	560	64-63	.507
12	Cleveland Indians	.506	64	61	.512	.504	18	546	526	65-60	.519
13	New York Yankees	.503	63	61	.508	.502	15	487	530	57-67	.458
14	Atlanta Braves	.503	66	61	.520	.498	14	483	469	65-62	.515
15	Pittsburgh Pirates	.502	65	62	.512	.499	11	532	537	63-64	.495
16	Tampa Bay Rays	.501	61	65	.484	.507	16	498	483	65-61	.515
17	San Francisco Giants	.501	66	58	.532	.490	12	487	452	67-57	.537
18	Miami Marlins	.494	63	63	.500	.492	19	507	533	60-66	.475
19	Cincinnati Reds	.494	61	66	.480	.498	17	488	475	65-62	.513
20	New York Mets	.492	60	68	.469	.499	21	485	493	63-65	.492
21	Chicago White Sox	.491	59	68	.465	.500	22	538	604	56-71	.442
22	Boston Red Sox	.490	56	70	.444	.505	23	483	547	55-71	.438
23	San Diego Padres	.488	59	66	.472	.494	20	417	426	61-64	.489
24	Minnesota Twins	.488	55	70	.440	.504	24	524	574	57-68	.455
25	Houston Astros	.488	54	73	.425	.508	28	513	598	54-73	.424
26	Philadelphia Phillies	.482	56	71	.441	.496	25	488	565	54-73	.427
27	Chicago Cubs	.478	54	71	.432	.494	26	475	529	56-69	.446
28	Texas Rangers	.476	49	77	.389	.505	29	502	637	48-78	.383
29	Arizona Diamondbacks	.474	53	74	.417	.493	27	497	597	52-75	.409
30	Colorado Rockies	.468	50	76	.397	.492	30	590	659	56-70	.445

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.