Frank Lampard has won his first game as manager of Derby Country.
The first goal for Derby came from Mason Mount, just eight minutes after Reading scored in the second half.
A goal from Tom Lawrence in extra time sealed the win.
Derby County will next play Leeds on Saturday 11 August.
Later in the year, the club will face West Bromwich Albion in October, and Aston Villa, Birmingham City and Stoke in November.
They will take on rivals Nottingham Forest in their local derby at home on 15 December, and away on 23 February 2019.