2015 MLB Power Rankings: Rays, Marlins, Pirates streaking

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Apr 21, 2015; St. Petersburg, FL, USA; Tampa Bay Rays starting pitcher Chris Archer (22) throws a pitch during the second inning against the Boston Red Sox at Tropicana Field. Mandatory Credit: Kim Klement-USA TODAY Sports

As we enter the fourth week of the 2015 season, the Tampa Bay Rays, Miami Marlins and Pittsburgh Pirates are all riding five-game winning streaks.

The St. Louis Cardinals and New York Mets continue to reign as the elite teams in the National League while the Houston Astros have and Detroit Tigers remain as division leaders in the American League.

Trending down this week are the Washington Nationals, Baltimore Orioles and Atlanta Braves.

Here are the rankings for this week

63. <strong><a href=. (13-6). Previous: 1st. Detroit Tigers. 1. team

2. team. 33. The root of the Cardinals success this season can be attributed to currently having baseball’s lowest ERA. That could very well change soon as <strong><a href=. (12-5). Previous: 4th. St. Louis Cardinals

3. Many are impressed by the Mets’ 11 game winning streak which finally came to an end last week. But are they really this good or have they just taken advantage of an easy schedule to start the season?. (14-5). Previous: 5th. New York Mets. 3. team

Previous: 3rd. Kansas City Royals. 4. team. 7. We are not even a full month into the season and <strong><a href=. (12-6)

71. After a week in which the Los Angeles Dodgers were swept by the San Francisco Giants, the team received even more bad news as injuries to both <strong><a href=. (11-7). Previous: 2nd. Los Angeles Dodgers. 5. team

6. team. 4. The Pirates look to have a true ace in <strong><a href=. (11-8). Previous: 13th. Pittsburgh Pirates

Next: Where do the Padres rank?