“Nobody does it better,” sang Carly Simon in the theme song to 1977’s James Bond flick The Spy Who Loved Me. And that ditty seems apt for Round 3, Day 4 of our Ultimate Female Law-Enforcement Crushes Bracket Tournament, which features a pair of super-sexy agents battling to advance to the Quarterfinals.

Psych’s Juliet Tries to Topple Castle’s Kate in ‘Law-Enforcement Crushes’ Tourney

Indeed, we’ve got Alias‘ Sydney Bristow squaring off against Chuck‘s Sarah Walker, and while both will enter the single-elimination world of the TVLine Thunderdome, only one will leave!

Every afternoon over the next couple of weeks, in fact, we’ll launch another set of bouts that will test the strength of your character allegiances. So make sure the right choice is made by heading down to our polls to vote for your favorites (Round 3 voting will be open for 72 hours), and hit the comments to justify your picks.

NCIS: LA’s Kensi Vs. NCIS’ Ziva as ‘Law-Enforcement Crushes’ Rages On!

(Oh, and in case you’re wondering/fretting, we put a cap of two cast members per show, which meant some fan favorites had to warm the bench this time around.)

Also, if you’re interested in the match-ups we’ve got planned for the coming weeks, CLICK HERE TO CHECK OUT THE ENTIRE 64-PLAYER BRACKET (then click again for a zoomed-in view) — and sign up to follow me on Twitter @MichaelSlezakTV.

Now ready, set, vote!