Ghiretti joins Pourchaire and Stanek in Sauber-backed US-Charouz F4 line-up by Peter Allen 19 February 2019 by Peter Allen 19 February 2019 South East Asian Formula 4 champion Alessandro Ghiretti will race in the German and Italian series this year with the Sauber-backed partnership between US Racing and Charouz, joining Theo Pourchaire …