Cooper led NFL rookies in nearly every receiving category by posting 72 receptions for 1,070 yards (14.9 avg.) with six touchdowns in 2015. He became the first ever Raiders rookie to reach 1,000 receiving yards and set franchise records for receptions and 100-yard games by a rookie with five.

The 6-foot-1, 210-pound wideout led the team in receiving yards and yards per catch, while ranking first among NFL rookies in receptions, receiving yards and tying for first in touchdowns. Additionally, his 72 catches are the most ever by a wide receiver 21 or younger and his yardage total is the second most by a NFL player 21 or younger.

Cooper saw the first of his five 100-yard games come in Week 2 against Baltimore, while also becoming the youngest Raiders wide receiver to catch a touchdown pass. In Week 3 at Cleveland, Cooper became the first Raiders rookie with 100 receiving yards in back-to-back games since James Jett (Nov. 21-28, 1993) and joined DeSean Jackson (2008) as the only NFL rookies in the past 30 years with two 100-yard receiving games in their team's first three games. Cooper's five 100-yard games are tied for the second most by a rookie since the 1970 AFL-NFL merger.