Basel held off a spirited Frankfurt to book a Europa League quarter-final against Shakhtar Donetsk.
The Swiss side held a three-goal advantage from the first leg in March, played before the coronavirus shutdown.
Frankfurt started brightly in search of an early lifeline and centre back Martin Hinteregger went close with a header.
Fabian Frei scored a late winner as Basel confirmed their place in the last eight
Frei finally broke the deadlock when he rolled the ball into the net in the 88th minute
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