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The other Indian in fray, Kishore Jena, bowed out of contention to make the 12-man final on Thursday after managing a best of 80.73m.
World champion Kipyegon had finished second in 14:29.60 but was disqualified after a clash with Ethiopian world record holder Gudaf Tsegay on the penultimate lap.
Sable finished fifth in his heat with a timing of 8:15.43.
In a photo-finish, Jamaica's Kishane Thompson claimed silver, just five-thousandths of a second off Lyles' pace.
Alfred's gold gave Saint Lucia their first ever medal of any colour at an Olympics. The island nation only began competing at the Games in 1996.
The world record holder battled with a nerve issue in his elbow this year but had no issues at the Stade de France as he produced his best throw of the season on his third attempt and clapped with satisfaction.
Parul, who holds the national record of 15 minutes 10.35 seconds, clocked 15:10.68 to finish 14th in heat number one and 24th overall while Ankita ended at 20th and last position in heat number one and overall 40th.
The German suggested that the competition could be wide open in the Olympics.
He delighted the London crowd with a trademark come-from-behind win in a personal best of 9.81 seconds - a two hundredths of a second improvement.
In an interview with Malayala Manorama, Nair talks about the Indian athletic team's preparation for the quadrennial event.
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