After his success at the Pietro Mennea Golden Gala, Matteo Sioli doubled his high jump success at the Diamond League in Doha, beating Qatari star Mutaz Barshim. The 20-year-old from the Fiamme Azzurre team secured victory with his third attempt at 2.29m, after an error-free run of 2.16m, 2.20m, 2.24m, and 2.27m, touching the bar. The bar remained upright in the vault, securing his second consecutive victory this season on the circuit. The European Under-23 champion from Lombardy matched his second career-best performance, equaling the height that earned him bronze at the European Indoor Championships in Apeldoorn.…