Since arriving in Australia almost two weeks ago, he has trialled at a handful of clubs as he transitions to a new sport, having grown up playing basketball and American football.
West Australian Jarrod Garlett and Nathan Drummond also competed well, recording jumps of 76cm, while likely top-three draft pick Christian Petracca's basketball background came to the fore with a 74cm leap.
Fellow American Evan Bruinsma, who is also trialling to win a position as an international rookie, was a standout in the running vertical jump.
Bruinsma recorded a 97cm running jump – equalling the second-best jump of all time behind Nic Naitanui's 102cm leap in 2008.
Baynham's 95cm jump was the third-best of all time, while Daniel McKenzie showed the explosiveness in his game with a 94cm jump – the fourth-best ever recorded.
McKenzie has had some injury interruptions this season but finished the year strongly with the Oakleigh Chargers in their TAC Cup premiership.
A number of likely early draft selections are not testing at this week's combine due to injury. Paddy McCartin (groin), Lachie Weller (leg), Isaac Heeney (knee), Angus Brayshaw (ankle) and Peter Wright (knee) are among the batch who are unavailable.
In the spirit of reconciliation the AFL acknowledges the Traditional Custodians of country throughout Australia and their connections to land, sea and community. We pay our respect to their Elders past and present and extend that respect to all Aboriginal and Torres Strait Islander peoples today.