That cicrulating info about Fawcett and Glass from 1975 is boring as hell because it wasn't a normal tournament, not a predecessor of today's ATP tournaments. That info is as worth as saying that the longest known singles tie-break occurred in a match Gallardo def. Giraldo 7-6(20) 6-2 in Campos do Jordao.
Casablanca 1996: Berasategui def. Filippini 6-2 6-3, third game of the 2nd set lasted 28 minutes (20 deuces) - it's at least ATP record.
stroke <- point <- game <- set <- MATCH -> round -> tournament -> season -> career