The 195cm Grzesiak, who competed at Olympic trial level in the track decathlon and also has a background in American football, won the agility run with a time of 8.11 seconds.
Along with Matt Sauey and Cliff Ederine, Grzesiak also jumped 86cm in the standing vertical jump, breaking the record of 85cm.
To emphasise his athleticism, Grzesiak also excelled in the three-kilometre time trial, winning in 10 minutes and 34 seconds, almost a minute ahead of second-placed Taylor Broekhuis.
The players were also put through a skill test in front of AFL club representatives, which national talent manager Kevin Sheehan said was a success.
“All participants showed their natural talent with the AFL football in an impressive skills session under the direction of former Sydney Swans coach Paul Roos with assistance from AFL international talent coordinator Tadhg Kennelly and AFL Academies development manager Mick Ablett,” Sheehan said.
“This concept has broken new ground for the AFL with the undoubted prospect of unearthing the next Nic Naitanui or Mike Pyke from the USA who can impact the AFL.”
Two or three athletes from the combine will be selected to attend October’s NAB AFL Draft Combine at Etihad Stadium.
Top Performers from USA International Combine in LA
Speed (20m sprint)
| NAME | Result | Height | UNIVERSITY | BACKGROUND |
| 1. Akeen Johnson | 2.86.sec | 195cm | St Francis College | Basketball |
| 2. Olatunji Kosile | 2.97sec | 208cm | UMES | Basketball and soccer |
| 3. Jamell Harris | 3.02sec | 203cm | Eastern Michigan University | Basketball |
Agility (AFL agility run)
| NAME | Result | Height | UNIVERSITY | BACKGROUND |
| 1. David Grzesiak | 8.11sec | 195cm | University of Wisconsin | Track decathlete - Olympic trials, football |
| 2. Cliff Ederine | 8.13sec | 194cm | Eastern Washington | Basketball |
| 3. Demario Hines | 8.14sec | 201cm | IPFW | High school and college basketball |
Standing vertical jump
| NAME | Result | Height | UNIVERSITY | BACKGROUND |
| 1= David Grzesiak | 86cm | 195cm | University of Wisconsin | Track decathlete - Olympic trials, football |
| 1= Matt Sauey | 86cm | 201cm | University of North Florida | Soccer and basketball |
| 1= Cliff Ederine | 86cm | 194cm | Eastern Washington | Basketball |
Running vertical jump
| NAME | Result | Height | UNIVERSITY | BACKGROUND |
| 1. Cliff Ederine | 102cm | 194cm | Eastern Washington | Basketball |
| 2 = Matt Sauey | 101cm | 201cm | University of North Florida | Soccer and basketball |
| 2 = David Grzesiak | 101cm | 195cm | University of Wisconsin | Track decathlete - Olympic trials, football |
Follow AFL website reporter Callum Twomey on Twitter at @AFL_CalTwomey.
