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| 25.07.2018 | 10:00 | Busan Transportation Corporation | - | Jeonbuk FC | 1:3 (0:1) | |
| 12:00 | Gyeongnam FC | - | FC Seoul | 1:3 (0:0, 0:0, 0:0) i.E. | ||
| 12:00 | Chuncheon FC | - | Daejeon Korail | 2:1 (0:0) | ||
| 12:00 | Gangneung City FC | - | Cheonan City FC | 1:2 (1:1, 1:1) n.V. | ||
| 12:00 | FC Anyang | - | Mokpo City FC | 1:2 (0:1, 1:1) n.V. | ||
| 12:00 | Ansan Greeners | - | Asan Mugunghwa FC | 0:1 (0:0, 0:0) n.V. | ||
| 12:30 | Incheon United | - | Pocheon FC | 2:0 (1:0) | ||
| 12:30 | Ulsan Hyundai FC | - | Suwon FC | 1:0 (0:0) | ||
| 12:30 | Pohang Steelers | - | Jeonnam Dragons | 0:1 (0:0) | ||
| 12:30 | Gimpo Citizen FC | - | Suwon Bluewings | 1:6 (0:3) | ||
| 12:30 | Daegu FC | - | Yongin University | 4:1 (0:0) | ||
| 12:30 | Yangpyeong FC | - | Sangju Sangmu | 4:2 (0:0, 1:1, 2:2) i.E. | ||
| 12:30 | Gimhae City FC | - | Gangwon FC | 2:1 (0:0) | ||
| 12:30 | Jeju United | - | Korea University | 4:1 (1:0) | ||
| 13:00 | Busan IPark | - | Gyeongju Citizen FC | 3:2 (0:1, 2:2) n.V. | ||
| 13:00 | Gyeongju KHNP | - | Seongnam FC | 1:0 (0:0, 0:0) n.V. |
