He has broken the hour mark several times since running a time of 59 : 31 in Lisbon 2000 .
Ivuti made his debut over the marathon distance at the 2005 Chicago Marathon .
Ivuti has broken the hour mark several times since running a time of 59 : 31 in Lisbon 2000 .
Ivuti made his debut over the marathon distance at the 2005 Chicago Marathon .