I ask this because in 2018 John Isner and Kevin Anderson had a set that latest for 50 games in one set. And in 2010, John Isner and Nicolas Mahut had a set lasting 138 games.
I understand that to win a set you must win by 2 games. So is it possible for a tennis match to actually last forever if the winner of a game kept alternating each game? Or is there a time/score limit where the officials call it?