Who has won most Grand Slams in open era in men's tennis?

The Open Era is the current era of professional tennis. It began in 1968 when the Grand Slam tournaments allowed professional players to compete with amateurs, ending the division that had persisted since the dawn of the sport in the 19th century.

Grand Slams – the biggest prize in tennis
The Grand Slam tournaments, also known as the majors, are the four most important annual tennis tournaments worldwide. The Australian Open, French Open ,Wimbledon and US Open (hard court) .

The Serbian modern great Novak Djokovic is the male player with the most victories at the Australian Open - he has lifted the trophy a record 9 times, including three times in a row between 2011 and 2013. Meanwhile, Spaniard left-hander Rafael Nadal is the undisputed king of clay, having won the French Open Grand Slam a record 13 times, twice as many as the second player on the list, Björn Borg.

Roger Federer shares the record for career Grand Slam singles titles with Rafael Nadal and Novak Djokovic. The big question is whether or not Federer will keep it.

He hasn't won a Grand Slam singles title since 2018, although he came as close as humanly possible to winning another Wimbledon title in an epic tiebreaker loss to Djokovic in the 2019 Wimbledon final