The Britney Spears 2016 Song Bracket - Sweet Sixteen

There were a few more upsets in the second round, but all four No. 1 seeds made it through to the second week intact.

After following the NCAA Tournament's schedule to get from 68 to 16, we're gonna speed things up now. Here's how the rest of the 2016 Britney Bracket will go:

- Sweet Sixteen: Tuesday
- Elite Eight: Wednesday
- Final Four: Thursday
- Championship: Friday

So by the end of this week, we'll know once and for all which is the greatest Britney Spears song of all time (at least among the people who vote on the Twitter polls).

Here's how the field looks as we head into the Sweet Sixteen:

X Factor Region

(1) Toxic def. (4) Me Against the Music, 98-2
(2) Lucky def. (6) Ooh Ooh Baby

Crossroads Region

(1) I'm a Slave 4 U def. (5) I'm Not a Girl, Not Yet a Woman, 62-38
(3) Overprotected def. (15) Trouble, 54-46

MMC Region

(1) ...Baby One More Time def. (4) Sometimes, 73-27
(2) Stronger def. (6) Breathe on Me, 84-16

Chaotic Region

(1) Oops!...I Did It Again def. (13) Till the World Ends, 81-19
(15) (You Drive Me) Crazy (Album Version) def. (6) Womanizer, 65-35