Federer appears unwilling to risk his troublesome knee after an injury-plagued past 18 months.
The 20-time Grand Slam title winner, who will be forty in two months’ time, had battled over three and a half hours until 12.45am Sunday morning to reach the last 16 in Paris.
The Swiss star was due to play Italy’s Matteo Berrettini today for a place in the quarter-finals, but Federer had cast doubt over whether he would continue following his win over Dominik Koepfer.
He is chasing a ninth title at Wimbledon which starts on June 28.
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