It was a match made in hell.

Jury selection begins Monday in an epic legal battle between the ousted Tinder founder, Sean Rad, and Barry Diller's media company, IAC/InterActiveCorp, involving sex harassment, secret recordings and a billion-dollar disagreement over the value of the hookup app.

Rad claims that he built the company with his cohort of marketing and computer nerds after realizing he was too geeky to score without his smartphone.

"The problem crystallized one night at a restaurant with friends," states the civil complaint. "The restaurant was full of young people potentially interested in forming new connections, but his friends focused on their phones instead of interacting with others in the room."

Rad hooked up with a tech incubator partially funded by Diller's company for his day job, and he developed Tinder on the side. IAC's subsidiary, Hatch Labs, took a minority stake in the startup, according to court papers. In fact, Rad claims that Diller's group, which also owns Match.com, showed no interest in the younger dating app, forcing the tech entrepreneur to go out and raise money himself to get it off the ground.

Seeking support from the deep pockets of IAC, Rad agreed to sell a larger share to Diller in exchange for stock options.

But when the company blew up, Diller's company took over, sidelining Rad and his partners, and by lowballing the valuation of Tinder, IAC cheated the techies out of billions