Matthew Brabham, the grandson of three-time Formula 1 world champion Jack, will make his debut in the Australian Supercars series this weekend. The 23-year-old will drive a Lucas Dumbrell Motorsport Holden at Barbagallo Raceway in the fourth event of the 2017 season, in what is currently a one-off deal. Brabham has spent most of his career in the USA - where his father Geoff was an Indycar and IMSA sportscar driver - and made his Indianapolis 500 debut last year in a KV Racing-run entry, while he also contested a pair of Formula E events with Andretti Autosport in 2014/15. Lacking relevant tin-top experience, Brabham has been granted the required superlicence by governing body CAMS and will partner 2017 rookie Alex Rullo. "[Brabham's] got a massive hill to climb in front of him, similar