WIMBLEDON, England — A day after losing the longest semifinal match in Wimbledon’s history, John Isner signed off from the tournament on Saturday morning with a tweet expressing gratitude for the support he had received, and also issuing an apology.

“Sorry for screwing up the schedule today,” he said.

Isner probably could not have anticipated that his 6-hour, 36-minute loss to Kevin Anderson on Friday would be joined in the record books before he even returned home.

Novak Djokovic and Rafael Nadal, whose semifinal was halted because of a local curfew at 11 p.m. Friday night, played for 2 hours 22 minutes more on Saturday to complete what turned out to be the second-longest semifinal in Wimbledon history, right behind Isner and Anderson.

Surviving a seesaw of shotmaking and speed that was in steep contrast to the booming serves of Isner and Anderson, Djokovic won, 6-4, 3-6, 7-6 (9), 3-6, 10-8, in 5 hours 15 minutes.