Mayes waited 757 days between AFL games, having left Brisbane for his native South Australia as part of the Chad Wingard trade. After 101 games for the Lions, Mayes waited more than two years for his Port Adelaide debut but made it count in 2020. His first game for the club was the memorable after the siren win over Carlton in Brisbane with Mayes playing a key role in the match-winning goal to Robbie Gray. He went on to play six games in 2020, averaging 13.5 disposals and more than three marks per game as a composed presence across half back.

Initially in consideration to be drafted by Port Adelaide in the 2012 draft, he slipped to pick 8, with the Power opting to select Ollie Wines ahead of him. A skilful half-forward/wingman who played senior football with North Adelaide in the SANFL as an 18-year-old, Mayes offers experience, class and determination as well as versatility, and will be looking to add to his games tally in 2021.

Honours

- Rising Star nominee (Round 12, 2013)
- Rookie of the Year (Brisbane; 2013)
- Fos Williams Memorial Trophy (SANFL Most Dedicated; 2019)