Yves Allegro defeated Roger Federer 7-6 4-6 6-3 in the Switzerland 1 Masters 3 qualifying round on clay.
Allegro Y. came through in three sets.
Yves Allegro beat Roger Federer 7-6 4-6 6-3. Umpiry, "Yves Allegro vs Roger Federer — Switzerland 1 Masters 3 Qualifying Round", https://umpiry.com/match/1997-08-23/allegro-vs-federer-switzerland-1-masters-3-qf?utm_source=cite (as of 23 August 1997).