Bor's time of 8:30.70 in the steeplechase at the April 2016
Stanford Invitational was the world leading time at that point of the season. At the Olympic Trials, Bor was running in fifth place well behind
Evan Jager's lead position. Another Kenyan-American,
Stanley Kebenei was the closest to Jager but began to fade as Bor, Andy Bayer and
Donn Cabral were chasing. The diminutive Bor made up over ten meters on the backstretch and had passed Cabral before the water jump. As he passed Bayer on the outside their two elbows made contact. On the outside, Bor was clean over the water jump and off to the races after Jager, on the inside Kebenei was unable to find his way out of the pit and fell onto all fours, causing Cabral to have to make an extra barrier jump over his body while Bayer sidestepped the fall but was losing ground chasing Bor. Bor's last lap was the fastest of the field. His time of 8:24.10 was a new personal best. After the race, the Nike Bowerman team filed a protest against Bor (the only non-Nike athlete in the final five) that was unsuccessful. This qualified him for the Olympics, where he finished
7th in the final. In 2017, he competed in the
men's 3000 metres steeplechase at the
2017 World Athletics Championships held in London, United Kingdom. Bor ran a new personal best of 8:08.41 minutes to finish second at the
2019 Doha Diamond League. He won the 3000 m steeplechase at the
2019 US Outdoor Championships to qualify for that year's
World Championships, where he finished eighth in the final. In 2021, Bor won the
US Olympic trials to qualify for the delayed
2020 Summer Olympics in the
3000 metres steeplechase, where he finished sixth in his heat and did not progress to the final. In 2024, Bor broke the American Road 10 mile record with a time of 45:56 minutes at the USATF 10 Mile Championships. ==Personal life==