Lilian Kasait Rengeruk (born 3 May 1997, Keiyo District) is a Kenyan female long-distance runner. She won the bronze medal in the women's senior race at the 2017 World Cross Country Championships. Rengeruk is the former 3000 metres World Under-18 champion and World U20 Championship silver medallist.
In September 2022, Rengeruk was banned for 10 months commencing April of that year due to the use of hormone therapy drug.
Career Rengeruk had her first successes in 2013, winning the Kenyan youth trials race before beating Ethiopia's Berhan Demiesa to take the 3000 metres title at the 2013 World Youth Championships in Athletics.Bamford, Nicola (2013-07-10). World youth lead for Rengeruk to win 300. IAAF. Retrieved on 2018-01-15. The following year she placed fifth in the junior race at the African Cross Country Championships, sharing in the team gold. She pre-fixed a win at the Kenyan junior trials with a 3000 m best of 8:53.41 minutes on her IAAF Diamond League debut in Doha.Mutuota, Mutwiri (2014-06-25). Alfred Kipketer the star of the Kenyan trials for the IAAF World Junior Championship. IAAF. Retrieved on 2018-01-15. At the 2014 World Junior Championships in Athletics, however, she was outdone by American home athlete Mary Cain, leaving Rengeruk with the silver medal.Morse, Parker (2014-07-25). Crowd control collapses as Cain beats her rivals into submissio. IAAF. Retrieved on 2018-01-15.
Rengeruk's 2015 season was prematurely curtailed and she did not fare well at the 2016 African Cross Country Championships, managing only tenth in the junior race that year. She failed to make the top three at the Kenyan junior track trials that June.Lilian Kasait Rengeruk. Association of Road Racing Statisticians. Retrieved on 2018-01-15. She emerged a much improved athlete in 2017 running in the senior ranks, starting with runner-up finishes at the Discovery Cross Country and the Kenyan Cross Country Championships; she was the only athlete to keep pace with Irene Chepet Cheptai in the national race.Evans, Kip (2017-02-18). Barsoton and Cheptai take Kenyan cross-country title. IAAF. Retrieved on 2018-01-15. The Kenyan women's team was very strong for the 2017 IAAF World Cross Country Championships and Rengeruk took the bronze medal in the senior race as part of a Kenyan sweep of the top six places, where Cheptai was the victor.Ramsak, Bob (2016-03-26). Cheptai leads unprecedented top-six sweep for Kenya – IAAF World Cross Country Championships Kampala 20. IAAF. Retrieved on 2018-01-16.Dutch, Taylor (2017-03-26). Kenya Claims Unprecedented Team Victory At IAAF World Cross Country. Flotrack. Retrieved on 2018-01-16. Although Rengeruk won the 5000 metres at the Kenyan Police Championships and the Kenyan Athletics Championships, she missed out on World Championships selection at the trials meet. She did perform well on the Diamond League circuit, having her first top three finish at the Prefontaine Classic in a personal best of 14:36.80 min, as well as setting a best of 8:32.73 min in the 3000 m at the Herculis meet.
She opened her 2017–18 cross country season with wins at the Tuskys Wareng Cross Country and Campaccio.Sampaolo, Diego (2016-01-06). Kibet and Rengeruk claim top spots at Campacci. IAAF. Retrieved on 2018-01-16.
In 2019, she competed in the senior women's race at the 2019 IAAF World Cross Country Championships held in Aarhus, Denmark. She finished in 12th place.
Doping ban In September 2022, it was announced that Rengeruk had been banned from athletics for a period of 10 months commencing April 2022 for the use of hormone therapy drug Letrozole.
Personal bests 3000 metres – 8:28.96 (2021) 5000 metres – 14:23.05 (2023) Lilian Kasait RENGERUK. World Athletics. Retrieved on 2022-09-22.
International competitions 2013World Youth ChampionshipsDonetsk, Ukraine1st3000 m8:58.742014African Cross Country ChampionshipsKampala, Uganda5thJunior race19:511stJunior team13 ptsWorld Junior ChampionshipsEugene, United States2nd3000 m9:00.532016African Cross Country Championships Yaoundé, Cameroon10thJunior race19,482017World Cross Country ChampionshipsKampala, Uganda3rdSenior race32:111stSenior team10 pts2018African ChampionshipsAsaba, Nigeria5th5000 m16:04.512019World Cross Country ChampionshipsAarhus, Denmark12thSenior race37:352ndSenior team25 ptsAfrican GamesRabat, Morocco1st5000 m15:33.63World Athletics ChampionshipsDoha, Qatar5th5000 m14:36.052021Olympic GamesTokyo, Japan12th5000 m14:55.852023World ChampionshipsBudapest, Hungary10th5000 m14:59.322024Olympic GamesParis, France5th10,000 m30:45.04
Circuit wins, and National titles Diamond League 2018: London Anniversary Games (3000 m) Kenyan Athletics Championships 5000 metres: 2017
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