Lee, unbeaten in his career like Plant, will challenge for the world title in the main event of Premier Boxing Champions on FOX.
In the main event of the night, heavyweights Renan Ferreira and Brett Martin square off live on AXS TV from Madison, Wisconsin.
“UFC APEX is going to be a massive game changer for combat sports and for UFC,” said UFC President Dana White in a release.
Davis, a two-time super featherweight world champion, will defend his crown against Ricardo Nunez on Saturday, July 27 live on Showtime.
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The card also featured Dakota Cochrane earning a decision over Chris Leben and Johnny Bedford becoming a Bare Knuckle FC champion.
One of the featured finishes of the night came on the prelims where Jairzinho Rozenstruik knocked out Allen Crowder in just nine seconds.
The 24-year-old Shields (9-0, 2 KOs) says she looks forward to resuming training and having the fight take place this fall.
The card streams live online and features a grudge match between former boxing champion Paulie Malignaggi and ex-UFC fighter Artem Lobov.
As Rousey's skills hit the mainstream, women's MMA followed and continues on to this very day with females headlining major cards.
Just six months after the pair of first met, the rematch will take place just 75 miles south of at Webster Bank Arena in Bridgeport, Conn.
Check out the post below for a live video of the entire card, which begins at 7 p.m. PDT, along with the current fight card for the night.