The defending champions and a certain expansion team are the big movers in our Major League Soccer Power Rankings, with the third week of the 2017 MLS season in the books.

1. Portland Timbers (no change)

Portland expects to get goals from Diego Valeri and Fanendo Adi, but when David Guzman finds the back of the net it's a bonus -- especially when it proves important in a 4-2 win over the Houston Dynamo.

2. FC Dallas (no change)

Back at close-to-full strength in league play, Dallas looked fatigued against the New England Revolution following their CONCACAF Champions League win over Pachuca at midweek, but still managed to pull off a 2-1 win at home.

3. Toronto FC (+4)

Without Sebastian Giovinco the Reds looked pretty toothless against the Vancouver Whitecaps, but Brek Shea's red card provided a spark as they scored twice late in a 2-0 victory.

4. Seattle Sounders (+6)

The first win of the year for the Sounders, a 3-1 result over the New York Red Bulls, also saw the first goal of the year for U.S. forward Jordan Morris.

5. New York Red Bulls (-2)

Two shots on goal at Seattle is not going to cut it for a team that is used to creating more clear-cut chances, even on the road.

6. Houston Dynamo (-1)

The first major test of the Dynamo's new-look side proved that it might be the defense that needs some work under head coach Wilmer Cabrera, as they let in four goals at Portland.

7. Atlanta United (+9)

It's getting harder and harder to deny that Atlanta United might be one of the best teams in the Eastern Conference after their 4-0 thrashing of the Chicago Fire, in which Josef Martinez added to his tally with a brace.

8. Orlando City SC (+1)

Cyle Larin has scored 31 goals in 59 career games entering 2017 and has already added three more this year after striking two times in Orlando's 2-1 win vs. the Philadelphia Union. What a stud!

9. New York City FC (-5)

Former Timber Rodney Wallace has proven to be a smart signing for NYCFC after striking his team's lone goal in a 1-1 draw with the Montreal Impact.

10. San Jose Earthquakes (-4)

The San Jose attack took a big step back in the team's 2-1 loss to Sporting Kansas City, managing just five shots over the course of 90 minutes away.

11. Sporting Kansas City (+3)

A little skill and a little luck. Benny Feilhaber's goal was a peach and Quake's keeper David Bingham's howler was a gift in the 2-1 win.

12. Colorado Rapids (-4)

Saturday's 2-2 draw with Minnesota United was the first time the Rapids have given up more than a goal at home since 2015.

13. LA Galaxy (+4)

A very young Galaxy team went on the road to Utah and secured the club's first win of the year -- a 2-1 victory over Real Salt Lake. This was a big one for Curt Onalfo.

14. Montreal Impact (-3)

Montreal's ability to sit back and find chances on the break will always keep it in games, as it did on Saturday in New York.

15. Columbus Crew SC (+4)

A homegrown player proved to be the star in Columbus' 2-1 win over D.C. United, with defender Alex Crognale impressing in his Crew SC debut.

16. Chicago Fire (-4)

An own goal and a red card in the first 12 minutes is not the way to go on the road, even against an expansion team.

17. D.C. United (-4)

United's promised attacking prowess has not emerged. This more than anything is the biggest reason for the team's terrible start to the season.

18. Philadelphia Union (-3)

If there's a silver lining to the loss against Orlando for the Union, it's that forward C.J. Sapong is scoring goals again.

19. Real Salt Lake (-1)

RSL is good enough to beat L.A., but not when veteran leader Kyle Beckerman commits a silly foul and gets sent off just before halftime.

20. New England Revolution (-1)

The Revs finally got midfielder Xavier Kouassi on the field, but it wasn't enough to help them hold on in the 2-1 defeat at Dallas.

21. Minnesota United (+1)

Getting a result in Colorado is never easy, so there is something to build on for head coach Adrian Heath following the expansion side's first MLS point.

22. Vancouver Whitecaps (-1)

The Whitecaps can blame Shea's red card for their 2-0 loss to Toronto, but there are deeper problems to sort out at BC Place.