Usain Bolt races for gold in what is expected to be the last individual event of his career, the world championships 100m, live on NBC and NBC Sports Gold on Saturday.
Bolt starts in the last of three semifinals at 2:19 p.m. ET, along with arguably his biggest threat, American Christian Coleman.
The semifinals will be streamed on NBC Sports Gold for subscribers, with coverage beginning at 2.
The top two from each semifinal, plus the next two fastest overall, advance to the final at 4:15 p.m. ET.