[4] On his only appearance as a two-year-old Serpentine started the 10/1 sixth choice in the betting for a maiden race over eight and a half furlongs on soft ground at Galway Racecourse on 17 September.

[5] The 2020 flat racing season in England and Ireland was disrupted by the COVID-19 pandemic and Serpentine did not make his reappearance until 12 June when he contested a maiden over ten furlongs at the Curragh.

Although his lead steadily diminished in the last quarter mile he never looked to be in any danger of defeat and won by 5+1⁄2 lengths from Khalifa Sat with Amhran Na Bhfiann taking third place just ahead of Kameko and English King.

I'm not the lightest guy in the world, but thankfully, Aidan knows I'm riding out every day and I'm fit as a fiddle, so when a race like this pops up and he's got a few extra runners, he seems to give me a couple of spins".

[9] After a break of over two months Serpentine returned to the track for the 2400 metres Grand Prix de Paris which was run that year at Longchamp Racecourse on 13 September.

[11] At Ascot Racecourse on 17 October Serpentine was ridden by William Buick when he was dropped back in trip and started an 18/1 outsider for the Champion Stakes over ten furlongs.

He started at 30/1 for the Melbourne Cup and ran his usual front-running race, but weakened from over four furlongs out and finished twentieth of twenty-two runners, ninety-nine lengths behind Gold Trip.

[1] Having been moved from Hickmott to trainers Gai Waterhouse & Adrian Bott, Serpentine won a race in Australia for the first time, beating three rivals in the Robbie Fradd Open Handicap at Eagle Farm Racecourse in Brisbane.