The 2018 Busan Open was a professional tennis tournament played on hard courts. It was the seventeenth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Busan, South Korea between 14 and 20 May 2018.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Australia | Matthew Ebden | 83 | 1 | |
 India | Yuki Bhambri | 86 | 2 | |
 Canada | Vasek Pospisil | 88 | 3 | |
 Israel | Dudi Sela | 97 | 4 | |
| Lu Yen-hsun | 111 | 5 | ||
| Mackenzie McDonald | 114 | 6 | ||
 Japan | Go Soeda | 149 | 7 | |
| Jason Jung | 154 | 8 |
The following players received wildcards into the singles main draw:
Hong Seong-chan Kim Young-seok Na Jung-woong Oh Chan-yeongThe following player received entry into the singles main draw as a special exempt:
The following players received entry from the qualifying draw:
See main article: 2018 Busan Open – Singles.
Matthew Ebden def. Vasek Pospisil 7–6(7–4), 6–1.See main article: 2018 Busan Open – Doubles.
John-Patrick Smith 6–4, 6–3.