Answer
In Monaco, Joshua Cheptegei broke Kenenisa Bekele's 16-year-old 5000m record. Cheptegei won the race in a time of 12:35.36, which was more than a second faster than Bekele's previous record of 12:37.35. This is a significant achievement, as Bekele's record had been considered one of the most unbreakable in track and field.