Three of the biggest stars on the line-up for Friday’s ONE Championship 156 event in Singapore ran into issues at the event’s ceremonial weigh-ins on Thursday evening – but there is no cause for concern just yet. Like most combat sports organisations, ONE weighs its fighters 24 hours out from their fights. Yet the Asian martial arts organisation also takes the unique step of measuring its fighters’ hydration levels two times in the lead-up to their bouts, in an effort to curb the dangerous practice of extreme weight-cutting. At the ONE 156 ceremonial weigh-in, it was revealed that lightweight kick-boxing champion Regian Eersel, who will defend his title against Germany’s Arian Sadikovic in the event’s headlining attraction, failed his second pre-fight hydration test. So too did No 1 strawweight MMA contender Bokang Masunyane of South Africa, who will battle the division’s No 2 contender Jarred Brooks on the main card with a crack at champion Joshua Pacio on the line. The 17-year-old Swede Smilla Sundell, set to challenge Filipino-American star Jackie Buntan for the organisation’s inaugural strawweight Muay Thai title in the event’s co-headliner, passed her pre-fight hydration tests, but missed weight by one pound. ONE: Muay Thai prodigy Sundell, 17, says MMA could be next Undercard fighter Woo Sung-hoon of South Korea also failed his hydration test for his flyweight MMA fight with Brazil’s Windson Ramos. ONE Championship athletes are required to maintain a hydration value less than or equal to 1.0250 on their two pre-fight tests. The promotion did not disclose the hydration levels of the three fighters who failed their tests at Thursday’s weigh-ins. However, all three will be tested again at 9am local time on Friday, and will be allowed to fight if their hydration levels and weight are in check at that point. Sundell, meanwhile, will have another opportunity to weigh-in for her fight with Buntan at the same time, but will also need to pass another hydration test. If any of the aforementioned fighters miss their marks on Friday morning, their bouts could still be renegotiated as catchweight contests. In most cases, ONE Championship bouts ultimately go ahead as planned. See the complete weigh-in results for the event below: Featherweight MMA: James Yang (154 lbs) vs Keanu Subba (154 lbs) Catchweight submission grappling : Mikey (141 lbs) vs Imanari (142 lbs) Welterweight MMA: Jin Tae-ho (183 lbs) vs Agilan Thani (183 lbs) Lightweight MMA: Abraao Amorim (168 lbs) vs Park Dae-Sung (170 lbs) Strawweight MMA: Ayaka Miura (124 lbs) vs Dayane Cardoso (124 lbs) Flyweight MMA: Windson Ramos (134 lbs) vs Woo Sung-hoon (135 lbs) – Woo failed hydration test Atomweight Muay Thai: Marie Ruumet (113 lbs) vs Anissa Meksen (114 lbs) Heavyweight kick-boxing: Gianis Stoforidis (225 lbs) vs Andrei Stoica (222 lbs) Strawweight MMA: Gustavo Balart (125 lbs) vs Yosuke Saruta (125 lbs) Strawweight MMA: Danial Williams (125 lbs) vs Namiki Kawahara (123 lbs) Bantamweight MMA: Chen Rui (145 lbs) vs Song Min-jong (143 lbs) Bantamweight Muay Thai : Liam Harrison (145 lbs) vs Muangthai PK. Saenchai Muaythaigym (145 lbs) Strawweight MMA title eliminator: Bokang Masunyane (126 lbs) vs Brooks (123 lbs) – Masunyane failed hydration test Strawweight Muay Thai title fight: Jackie Buntan (125 lbs) vs Smilla Sundell (127 lbs) – Sundell missed weight Lightweight kick-boxing title fight: Arian Sadikovic (169 lbs) vs Regian Eersel (170 lbs) – Eersel failed hydration test