We have official pairings and song choices from https://www.tvinsider.com/930307/the-voice-season-18-knockout-pairings-songs-mega-mentor-james-taylor/
Team Blake
Joei Fulco ("When Will I Be Loved" by Linda Ronstadt) VS. Levi Watkins ("I Ain't Living Long Like This" by Waylon Jennings)
Team Kelly
CammWess ("Say Something" by A Great Big World) VS. Megan Danielle ("Piece By Piece" by Kelly Clarkson)
Team Legend
Darious Lyles ("Me and Mrs. Jones" by Billy Paul) VS. Mike Jerel ("Versace On the Floor" by Bruno Mars)
Team Blake
Cam Spinks ("Rumor" by Lee Brice) VS. Todd Tilghman ("Anymore" by Travis Tritt)
Team Nick
Roderick Chambers ("Redbone" by Childish Gambino) VS. Tate Brusa ("The Scientist" by Coldplay)
Team Legend
Joanna Serenko ("Angel From Montgomery" by John Prine) VS. Zan Fiskum ("The Story" by Brandi Carlile)