Photos: Claressa Shields, Christina Hammer - Tense Face To Face

Undefeated middleweight champions Claressa Shields and Christina Hammer went face-to-face in New York on Wednesday just three days before arguably the most significant event in women's boxing history this Saturday live on SHOWTIME from Boardwalk Hall in Atlantic City, N.J. (photos by Stephanie Trapp)

IBF, WBC and WBA Champion Shields (8-0, 2 KOs) will unify with WBO Champion Hammer (24-0, 11 KOs) for the undisputed middleweight world championship. The winner will become only the second undisputed champion in women's boxing history and only the sixth fighter - male or female - to unify all four recognized world titles.

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Joining Shields and Hammer at Gallagher's Steakhouse in Manhattan was unbeaten heavyweight contender Otto Wallin, who takes on Nick Kisner as part of the SHOWTIME BOXING: SPECIAL EDITION tripleheader beginning at 9:10 p.m. ET/PT.

Tickets for the live event, which is promoted by Salita Promotions, are priced at $150, $100, $55 and $35 and can be purchased through Ticketmaster and at boardwalkhall.com.

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