At 230 surely Charr will have a stamina advantage against the massive Ustinov? That combined with Charr's competent bodywork might be his best chance here.
Round 1: 10-9 Ustinov Round 2: 10-9 Ustinov Jab is landing for Ustinov and he throws in the occasional body shot. Charr continues to back up and take punishment when he finds his back on the ropes. Not enough punches coming from Charr.