 At the 1988 Summer Olympics in Seoul, Stewart came eighth in the 100 m final despite qualifying fourth fastest from the semi finals; his time of 12.26 was a result of slowing down before the end due to a leg injury.His position was later improved to seventh following the disqualification of race winner Ben Johnson.Because of his injury Stewart did not run on the 4 × 100 m relay team, which finished fourth in the final.