She made her televised debut by attacking Kairi Sane on December 27, and her televised in-ring debut on the episode aired January 10, 2018, defeating Dakota Kai by referee stoppage. Afterward, Baszler continued to attack Kai until NXT Women's Champion Ember Moon made the save. That led to a title match at on January 27, where Moon defeated Baszler to retain the title, but was attacked by Baszler afterwards. Baszler received another title match against Moon at on April 7, where Baszler defeated Moon by technical submission to win the title. On the May 30 episode of "NXT", Baszler successfully defended her title against Dakota Kai. She then began a feud with Nikki Cross, culminating in a match at , where Baszler defeated Cross by technical submission to retain the title. Baszler then lost the title to Kairi Sane at , ending her reign at 133 days. At Evolution, she defeated Sane in a rematch, becoming the first-ever two-time NXT Women's Champion. Baszler went on to successfully defend her title against Sane at , Bianca Belair at and in a fatal four-way against Sane, Belair and Io Shirai at , submitting Belair with a Kirifuda Clutch. Baszler would then feud with Shirai, retaining her title against Shirai at and on the June 26 episode of "NXT" in a steel cage match to end the feud. At , she defeated Mia Yim to retain her title. On the October 2 episode of "NXT", Baszler retained her title against Candice LeRae.