Twilight Son was sent into training with the veteran Henry Candy at Kingston Warren in Oxfordshire where he was soon joined by a gelding named Limato.

Ridden by Fergus Sweeney he took the lead inside the final furlong and won by half a length from the favoured Desert Force.

[5] Four weeks later, with Sweeney again in the saddle when the colt was assigned a weight of 131 pounds for a Nursery (a handicap race for two-year-olds) at Thirsk Racecourse.

[6] On his debut as a three-year-old, Twilight Son started odds-on favourite for a handicap over six furlongs at Newmarket Racecourse on 4 May with the best-fancied of his opponents being Desert Force.

[8] After the race a majority share in the colt was bought by the Cheveley Park Stud whose managing director Chris Richardson described him as " a very exciting prospect".

[9] After a break of almost three months, Twilight Son returned to the track and was stepped up in class for the Grade One Betfred Sprint Cup over six furlongs at Haydock Park.

He repelled the challenge of Magical Memory and then held off the strong late run of Strath Burn to win by a short head and three-quarters of a length.

[12] The British Champions Sprint Stakes at Ascot Racecourse on 17 October saw Twilight Son, now undefeated in five races, matched against the season's leading sprinter Muhaarar and start the 4/1 second favourite in a 20-runner field.

He was restrained by Sweeney in the early stages before staying on in the last quarter mile and finishing fifth of the twelve runners behind Magical Memory.

The other runners included Gold-Fun from Hong Kong, Signs of Blessing (Goldene Peitsche) from France, Undrafted (winner of the race in 2015) from the United States and Holler (Canterbury Stakes) from Australia.

Ridden by Ryan Moore, Twilight Son raced just behind the leaders Signs of Blessing and Holler before making a forward move approaching the final furlong.

In the July Cup at Newmarket he was in contention approaching the final furlong but faded badly in the closing stages and finished fourteenth of the eighteen runners behind his stablemate Limato.