During Cappa's time at Humboldt State, he was named the GNAC offensive lineman of the year for 4 years in a row. He was also named to the First Team GNAC every year of his playing career. Following his senior season, Cappa was invited to the 2018 Senior Bowl.
Professional career
On November 27, 2017, it was announced that Cappa had accepted his invitation to play in the Senior Bowl. He impressed scouts and NFL analysts with a strong week of practice before the Senior Bowl and helped solidify his draft stock. On January 27, 2018, Cappa played in the 2018 Reese's Senior Bowl and was part of Houston Texans'head coachBill O'Brien's South team that won 45–16 to Denver Broncos' head coach Vance Joseph's North team. He attended the NFL Scouting Combine in Indianapolis and completed all of the combine and positional drills. At the conclusion of the pre-draft process, Cappa was projected to be a fifth round pick by the majority of NFL draft experts and scouts. He was ranked as the 14th best offensive tackle prospect in the draft by DraftScout.com and was ranked the 15th best offensive tackle by Scouts Inc. The Tampa Bay Buccaneers selected Cappa in the third round of the 2018 NFL Draft. The Buccaneers traded their fourth and sixth round picks in the 2018 NFL Draft to the Minnesota Vikings in exchange for the Vikings' third round pick to draft Cappa. Cappa was the 12th offensive tackle drafted in 2018 and became Humboldt State's highest draft selection in school history. He also holds the distinction of being Humboldt State's 11th player drafted and the first player selected in the NFL Draft since Freeman Baysinger in 1992. On May 13, 2018, the Tampa Bay Buccaneers signed Cappa to a four-year, $3.36 million contract that includes a signing bonus of $793,704. According to the 2019 Tampa Bay Buccaneers Unofficial Depth Chart released September 4, 2019, Cappa will be the starting right guard against the San Francisco 49ers in game one of the regular NFL season. In a game against the New Orleans Saints on October 6, 2019 Cappa suffered a broken left arm but did not miss a snap after sustaining the injury in the second quarter. “I commend Alex Cappa,” Head Coach Arians told reporters. “He broke his arm in the second quarter and played the entire game." Cappa told reporters after the game that the injury was "just a bruise." During the COVID-19 outbreak Cappa has been particularly involved with supporting local restaurants and businesses. His efforts have also energized other Tampa Bay players to insure revenues continue for the local eateries.
