Who tops Power Rankings with a week to go?

It's here -- the final week of the regular season, which is also known as the calm before the chaotic storm that is October baseball.

Some of the postseason field has been decided, but there are still a few ongoing races. The American League Central will probably be the next chip to fall, considering the Twins' magic number is down to three. The two National League Wild Card spots are probably next, with the Nationals and Brewers having all but locked up those two spots, though Milwaukee is still alive in the NL Central race, three games behind the Cardinals.

• MLB standings

That leaves the AL Wild Card race as the most likely to go down to the final game of the season. The A's are in a good spot, entering the final week two games up and headed toward hosting the AL Wild Card Game. The Rays and the Indians have been jockeying for that second position for weeks, and with just a handful of games left, they remain in a deadlock.

The Rays’ final six games include one more home game with the Red Sox, two with the Yankees and three in Toronto to conclude the regular season. The Indians have road series against the White Sox and Nationals.

• Explaining postseason tiebreaker scenarios

On to the rankings:

Biggest jump: There was hardly any movement from last week to this week, which is not surprising given how little of the regular season is left. Two teams jumped two spots -- the D-backs from No. 16 to No. 14, and the Red Sox, from No. 15 to No. 13. Boston has been eliminated from postseason play contention, while Arizona is close to elimination in the NL Wild Card race.

Biggest drop: The Mets and Phillies dropped two -- the Mets from No. 14 to No. 16, and the Phillies from No. 13 to No. 15. Both will need something short of a miracle to still be in Wild Card contention by the middle of the final week, given the Nats and Brewers' strongholds on the top two spots in what was a wide-open race for most of the season's second half.

Power Rankings Top 5:

1) Astros (2 last week)

The Astros ended their home schedule on Sunday with a 60-21 record. The only other team in the past 40 years that won 60 home games was the 1998 Yankees, who were 62-19 at home and ended the season with a World Series championship. With the AL West title wrapped up, Houston can continue to focus on clinching home-field advantage throughout the postseason. All the Astros have to do is win five of their last six games to ensure they can't be caught by the Yankees. (Houston has the tiebreaker over New York thanks to its 4-3 record against the Bronx Bombers during the regular season.)

2) Yankees (1)

In two starts since returning from a season-long stay on the injured list, Luis Severino has pitched nine scoreless innings, striking out 13. His presence in the Yankees' rotation could pay huge dividends in the postseason, especially if he can start Game 2 or 3 of the AL Division Series. Meanwhile, New York received good news regarding a couple of injury situations: Gleyber Torres' MRI came back clean on his hamstring, and Edwin Encarnacion (oblique) could return as early as the Yankees' next series in Tampa, which begins Tuesday.

3) Dodgers (3)

The Dodgers have to be pleased about the recent performances of Hyun Jin Ryu, who has had two good outings after posting a 9.95 ERA over his prior four starts. Ryu allowed three runs over seven innings with eight strikeouts in the Dodgers' 7-4 win over the Rockies on Sunday. In his previous outing against the Mets, he tossed seven scoreless innings of two-hit ball. The Dodgers, while behind the Yankees and Astros in the race for the best record in the Majors, can clinch home-field advantage over the Braves in the NL as early as Tuesday.

4) Braves (4)

The NL East champs have a 24-9 record since Aug. 17, the best mark in the Majors over that stretch. They'll spend the next few days monitoring Freddie Freeman, who did not travel with the club to Kansas City and will instead receive treatment in Atlanta to address a bone spur in his right elbow. The malady appears to have been affecting the first baseman's overall production -- he hasn't homered since Sept. 1, and he slashed .103/.298/.138 over a recent 10-game stretch.

5) Twins (5)

The Twins have hit 296 homers this year, and 40 of them came off the bat of veteran slugger Nelson Cruz, whose opposite-field shot in the fourth inning on Sunday made him the 57th player in history to join Major League Baseball's 400-homer club. Meanwhile, the Twins have a somewhat opposite home/road split than other contenders. Minnesota has the best road record in baseball at 50-25, while it's 46-35 at home. This is good news for a team attempting to close out the AL Central title soon, since the Twins end the season with three games in both Detroit and Kansas City.

The rest of the Top 20:

6) A’s (7)
7) Rays (6)
8) Cardinals (8)
9) Nationals (9)
10) Indians (10)
11) Brewers (12)
12) Cubs (11)
13) Red Sox (15)
14) D-backs (16)
15) Phillies (13)
16) Mets (14)
17) Giants (18)
18) Reds (17)
19) Rangers (19)
20) Angels (not ranked)