4‑Dec‑2017 | USA F40 | Hard | R16 | 1341 | 1303 | (Q)Jacob Dunbar [USA] d. (WC)Knaff | 6-2 6-4 | | | | | | | | | |
4‑Dec‑2017 | USA F40 | Hard | R32 | 1341 | 269 | (WC)Knaff d. Austin Krajicek [USA] | 4-6 6-1 6-4 | | | | | | | | | |
13‑Nov‑2017 | USA F37 | Clay | R32 | 1350 | 462 | (2)Fabrizio Ornago [ITA] d. Knaff | 6-1 7-5 | | | | | | | | | |
24‑Jul‑2017 | Morocco F2 | Clay | R16 | 1528 | 775 | (8)Florent Diep [FRA] d. (Q)Knaff | 6-1 6-4 | | | | | | | | | |
24‑Jul‑2017 | Morocco F2 | Clay | R32 | 1528 | 1173 | (Q)Knaff d. Farzin Danny Amiri [USA] | 7-6(4) 7-6(6) | | | | | | | | | |
17‑Jul‑2017 | Belgium F5 | Clay | R32 | 1783 | 571 | (2)Mick Lescure [FRA] d. (Q)Knaff | 6-2 7-5 | | | | | | | | | |
10‑Jul‑2017 | Germany F7 | Clay | R16 | 1784 | 494 | (7)Jan Choinski [GER] d. (Q)Knaff | 7-6(1) 6-2 | | | | | | | | | |
10‑Jul‑2017 | Germany F7 | Clay | R32 | 1784 | 1477 | (Q)Knaff d. (Q)Antoine Walch [FRA] | 6-3 6-3 | | | | | | | | | |
26‑Jun‑2017 | Belgium F2 | Clay | R16 | 1648 | 443 | (7)Corentin Denolly [FRA] d. (Q)Knaff | 6-4 6-2 | | | | | | | | | |
26‑Jun‑2017 | Belgium F2 | Clay | R32 | 1648 | | (Q)Knaff d. (WC)Thomas Brees [BEL] | 6-1 6-2 | | | | | | | | | |
19‑Jun‑2017 | Belgium F1 | Clay | R32 | 1644 | 1111 | Mirko Martinez [SUI] d. (WC)Knaff | 7-6(7) 6-2 | | | | | | | | | |