In the 1925–26 season Roberts scored 9 goals in the FA Cup and Manchester City reached the final of that year's competition. In round 5 of the FA Cup in 1925–26 he scored 5 goals as Manchester City demolished Crystal Palace 11–4. Roberts' former team, Bolton Wanderers, defeated City 1–0 in the final with David Jack scoring the only goal. Roberts was City's top scorer in the league that season with 21 goals. Two of these goals came in a record 6–1 victory against Manchester United at Old Trafford. Despite this victory and the acquisition of Jimmy McMullan from Partick Thistle, City came 21st in the league and were relegated to the Second Division.