'Antonelli still needs to prove himself' according to Red Bull's Marko

Toto Wolff is throwing Andrea Kimi Antonelli into the deep end next year. The still-only 18-year-old driver has big shoes to fill at Mercedes, as he is the successor to seven-time world champion Lewis Hamilton. Helmut Marko has already seen Antonelli's great raw pace. Still, the advisor argues that the youngster still has everything to prove in the sport.