[3][5] As a 16 year old he won a silver medal at the inaugural 2010 Summer Youth Olympics in Singapore with a +9 cm personal best[6] of 2.19m.

He placed 5th after jumping a height of 2.33m, just 0.04m short of the shared winners, Mutaz Essa Barshim from Qatar and Gianmarco Tamberi from Italy.

[9] Starc first rose to prominence in the senior international track and field scene when, at 21 yrs of age, he made the high jump final at the 2015 IAAF World Championships, coming a creditable twelfth (the first Australian to contest a major men's high jump final since Tim Forsyth in 1997 at Athens).

[10] At the men's high jump at the 2016 Summer Olympics in Rio de Janeiro[11] he achieved a season best of 2.29m in the qualifying stage to make the final.

He then set a third personal best for the year and equalled the Australian and Oceania area high jump records of 2.36m (set by Tim Forsyth in 1997) in winning the prestigious annual Eberstadt Internationales Hochsprung (high jump only) meeting in Eberstadt, Germany on 26 August.

[17] Starc rounded off his 2018 European-summer campaign with a second place leap of 2.30m representing Asia-Pacific in the IAAF Continental Cup in Ostrava on 8 September 2018.