Democrat Jon Ossoff clinched victory in the second Georgia Senate runoff, US networks projected Wednesday, guaranteeing his party control of the body.

Ossoff defeated incumbent Republican Senator David Perdue with a nearly 25,000-vote margin, or 0.56 percent, with 98 percent of the expected vote counted, NBC and ABC projected.

His win, after fellow Democrat Raphael Warnock defeated Republican Kelly Loeffler in a parallel runoff election Tuesday, gave both parties 50 seats in the Senate.

With the chamber evenly split, Democratic Vice-president elect Kamala Harris will play the role of the tie-breaker, giving Democrats control of the Senate as well as the House of Representatives.