| 2018 Seoul Open Challenger | |
|---|---|
| Date | 30 April – 6 May |
| Edition | 4th |
| Surface | Hard |
| Location | Seoul, South Korea |
| Champions | |
| Singles | |
 Mackenzie McDonald | |
| Doubles | |
 Toshihide Matsui /  Frederik Nielsen | |
The 2018 Seoul Open Challenger was a professional tennis tournament played on outdoor hard courts. It was the fourth edition of the tournament. It was part of the 2018 ATP Challenger Tour. It took place in Seoul, South Korea, between 30 April and 6 May 2018.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 CAN | Vasek Pospisil | 82 | 1 |
 ISR | Dudi Sela | 96 | 2 |
 AUS | Jordan Thompson | 98 | 3 |
 TPE | Lu Yen-hsun | 112 | 4 |
| USA | Mackenzie McDonald | 141 | 5 |
| JPN | Go Soeda | 145 | 6 |
| TPE | Jason Jung | 154 | 7 |
| JPN | Tatsuma Ito | 176 | 8 |
The following players received wildcards into the singles main draw:
Chung Yun-seong Hong Seong-chan Kim Young-seok Park Ui-sung The following player received entry into the singles main draw as a special exempt:
The following players received entry from the qualifying draw:
Makoto Ochi Son Ji-hoon Renta Tokuda Yosuke Watanuki Mackenzie McDonald def. Jordan Thompson 1–6, 6–4, 6–1. Toshihide Matsui / Frederik Nielsen def. Chen Ti / Yi Chu-huan 6–4, 7–6(7–3).The 2016 Lecoq Seoul Open was a professional tennis tournament played on outdoor hard courts. It was the second edition of the tournament. It was part of the 2016 ATP Challenger Tour, offering a total of $100,000 in prize money. It took place in Seoul, South Korea, on 9–15 May 2016.
The 2016 Astana Challenger Capital Cup was a professional tennis tournament played on indoor hard courts. It was the first edition of the tournament which was part of the 2016 ATP Challenger Tour. It took place in Astana, Kazakhstan between 21 and 26 November 2016.
The 2017 Gimcheon Open ATP Challenger was a professional tennis tournament played on hard courts. It was the fourth edition of the tournament which was part of the 2017 ATP Challenger Tour. It took place in Gimcheon, Korea between 1 and 7 May 2017.
The 2017 Seoul Open Challenger was a professional tennis tournament played on outdoor hard courts. It was the third edition of the tournament. It was part of the 2017 ATP Challenger Tour. It took place in Seoul, South Korea, on 8–14 May 2017.
The 2017 Busan Open was a professional tennis tournament played on hard courts. It was the sixteenth edition of the tournament which was part of the 2017 ATP Challenger Tour. It took place in Busan, South Korea between 15 and 21 May 2017.
The 2017 Chengdu Challenger was a professional tennis tournament played on hard courts. It was the 2nd edition of the tournament which was part of the 2017 ATP Challenger Tour. It took place in Chengdu, China between 31 July and 6 August 2017.
The 2017 Gwangju Open was a professional tennis tournament played on hard courts. It was the 2nd edition of the tournament which was part of the 2017 ATP Challenger Tour. It took place in Gwangju, South Korea between 18 and 24 September 2017.
The 2018 Keio Challenger was a professional tennis tournament played on hard courts. It was the thirteenth (ATP) and second (ITF) editions of the tournament and part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Yokohama, Japan between 26 February and 4 March 2018 for the men's edition and between 5 and 11 March 2018 for the women's.
The 2018 Qujing International Challenger was a professional tennis tournament played on hard courts. It was the first edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Qujing, China between 19 and 25 March 2018.
The 2018 ATP Challenger China International – Nanchang was a professional tennis tournament played on hard courts. It was the fourth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Nanchang, China between 16 and 22 April 2018.
The 2018 Kunming Open was a professional tennis tournament played on outdoor clay courts. It was the seventh (ATP) and first (WTA) edition of the tournament and part of the 2018 ATP Challenger Tour and the 2018 WTA 125K series. It took place in Anning, China, from 23 April–5 May 2018.
The 2018 Gimcheon Open ATP Challenger was a professional tennis tournament played on hard courts. It was the fifth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Gimcheon, Korea between 7 and 13 May 2018.
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.
The 2018 OEC Kaohsiung was a professional tennis tournament played on hard courts. It was the seventh edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Kaohsiung, Taiwan between 17 and 23 September 2018.
The 2019 Seoul Open Challenger was a professional tennis tournament played on outdoor hard courts. It was the fifth edition of the tournament. It was part of the 2019 ATP Challenger Tour. It took place in Seoul, South Korea, between 29 April and 5 May 2019.
The 2019 Gwangju Open was a professional tennis tournament played on hard courts. It was the 4th edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Gwangju, South Korea between 13 and 19 May 2019.
The 2019 President's Cup was a professional tennis tournament played on outdoor hard courts. It was the fourteenth (ATP) and eleventh (ITF) editions of the tournament and was part of the 2019 ATP Challenger Tour and the 2019 ITF Women's World Tennis Tour. It took place in Nur-Sultan, Kazakhstan, on 15–21 July 2019.
The 2021 Columbus Challenger was a professional challenger level tennis tournament played on indoor hard courts. It was the tenth edition of the men's tournament which was part of the 2021 ATP Challenger Tour and the first edition of the women's event, that was part of 2021 WTA 125K series. It took place in Columbus, United States between 20 and 26 September 2021.
The 2022 Challenger Città di Lugano was a professional tennis tournament played on indoor hard courts. It was the 2nd edition of the tournament which was part of the 2022 ATP Challenger Tour. It took place in Lugano, Switzerland between 28 March and 3 April 2022.
The 2022 Orlando Open was a professional tennis tournament played on hard courts. It was the fifth edition of the tournament which was part of the 2022 ATP Challenger Tour. It took place in Orlando, Florida, United States between June 6 and 12 2022.
