As a freshman in 2013, Hollins was named special teams captain after appearing in all 13 games. He played on most special teams and as a reserve wide receiver. He finished the regular season with nine tackles and recovered a fumble against Duke. As a sophomore in 2014 Hollins earned honorable mention All-ACC accolades after finishing with 35 catches for a team-high 613 yards. He also had a team-best eight receiving touchdowns. One of Carolina’s best special teams players, he also had seven tackles and recovered an onside kick. Earned ACC Receiver of the Week honors after catching two passes for 120 yards and two touchdowns against Virginia. Both touchdowns were over 50 yards, making Hollins the first Tar Heel to have two touchdown receptions of 50+ yards since Hakeem Nicks in 2008. Reeled in a 91-yard touchdown pass in the win over San Diego State University. The 91-yard scoring play with QB Marquise Williams was the longest play by UNC in Kenan Stadium history and third-longest play in school history. As a junior in 2015, Hollins led all NCAA major college players with an average of 24.8 yards per reception. Caught at least one pass in all 13 games and found the end zone in seven different contests, including five of UNC’s six wins Picked up his second ACC Receiver of the Week honor after catching five balls for 165 yards and a 74-yard touchdown in the win over Duke. He became the first Tar Heel to catch three touchdown passes since 2011 when he tallied three scores against Wake Forest. His first ACC Receiver of the Week honors of the year came after catching three passes for 100 yards and two touchdowns in the win over Delaware.
College statistics
Professional career
Philadelphia Eagles
Hollins was drafted by the Philadelphia Eagles in the fourth round, 118th overall, in the 2017 NFL Draft. In Week 2, against the Kansas City Chiefs, he had his first three career receptions, which went for 32 total yards, in the 27–20 loss. In Week 7, against the Redskins, he recorded a 64-yard touchdown reception from quarterback Carson Wentz. His 64-yard reception was the first touchdown of his career. Hollins also played heavily on special teams. In 2018, Mack Hollins and the Philadelphia Eagles beat the New England Patriots in Super Bowl LII, with Hollins primarily playing special teams. On September 6, 2018, Hollins was placed on injured reserve with a groin injury. During the 2019 offseason, Hollins gave his jersey number, No. 10, to veteran DeSean Jackson, who had worn the number during his time playing in Philadelphia from 2008 to 2013. Hollins changed to No. 16. On December 3, 2019, Hollins was waived by the Eagles.
Miami Dolphins
On December 4, 2019, Hollins was claimed off waivers by the Miami Dolphins.