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| 1st(1st leg) | Olympique Marseille | - | RB Salzburg | 2:0 (1:0) | ||
| 2nd (2nd leg) | RB Salzburg | - | Olympique Marseille | 2:1 (0:0, 2:0) aet | ||
| 1st(1st leg): 26/04/2018 20:05 | 2nd (2nd leg): 03/05/2018 20:05 | Winner: Olympique Marseille | ||||
| 1st(1st leg) | Arsenal FC | - | Atlético Madrid | 1:1 (0:0) | ||
| 2nd (2nd leg) | Atlético Madrid | - | Arsenal FC | 1:0 (1:0) | ||
| 1st(1st leg): 26/04/2018 20:05 | 2nd (2nd leg): 03/05/2018 20:05 | Winner: Atlético Madrid | ||||
