On Sunday the Riders followed up with a thrilling 80-78 overtime victory against Manchester Giants to confirm their title credentials. Sullivan's team mate, Jay Couisnard was the hero this time sinking a crucial three pointer on the buzzer to take the game to overtime and another three in overtime to steal the victory.
Sullivan had a double-double with 14 points and 12 rebounds on Sunday.
The Riders closest rivals challenging the title are the Newcastle Eagles who need to beat Worcester Wolves on Tuesday to keep alive their slim title chances.
Even if Eagles win, Riders can win the BBL by beating Durham on Saturday.