Mavericks won the men's doubles and men's legends singles rubber but the Slammers clinched the women's singles, mixed doubles and the men's singles games to come out trumps in the tie.
Mavericks' team bench featured Serena Williams and Milos Raonic joining Mark Philippoussis, Richard Gasquet, Edouard Roger-Vasselin, Treat Huey, Ajla Tomljanovic and Jarmila Gajdosova.
Serena ended up on the losing side today, going down 4-6 to Karolina Pliskova.
A win already under their belt, the Slammers looked set for the evening from the first set on.
"Not only did I come prepared for the IPTL, I also have an 'IPTL special edition haircut! It's great to be playing in the IPTL, I've heard wonderful things about it from players on the tour these past few months, the fun and the motivating parts with the rest of the team members, and I was really looking forward to it," Raonic said after the match.