Sioux Falls Skyforce (2019–2020) After going undrafted in the
2019 NBA draft, Alexander joined the
Miami Heat for the
2019 NBA Summer League. On July 15, 2019, Alexander was signed by the Heat to a training camp contract. Following training camp, Alexander was added to the roster of the Heat's
NBA G League affiliate, the
Sioux Falls Skyforce.
Miami Heat (2020) On January 15, 2020, Alexander signed a two-way contract with the
Miami Heat. The following day, it was announced that Alexander was sidelined with a knee injury. He made his NBA debut on August 6, 2020, where he played one minute off the bench and recorded one rebound in a 130–116 loss to the
Milwaukee Bucks. The Heat reached the
2020 NBA Finals, but lost in 6 games to the
Los Angeles Lakers.
Fuenlabrada (2020–2022) On December 2, 2020, Alexander signed with
Fuenlabrada of the Spanish
Liga ACB. He averaged 9 points and 6.2 rebounds per game. On August 23, 2021, Alexander re-signed with the team.
Scarborough Shooting Stars (2022) On May 16, 2022, Alexander signed with the
Scarborough Shooting Stars of the
CEBL. On June 26, 2023, he parted ways with the club.
Hapoel Tel Aviv (2023–2024) On July 26, 2023, he signed with
Hapoel Tel Aviv of the
Israeli Basketball Premier League.
Türk Telekom (2024–present) On July 11, 2024, he signed with
Türk Telekom of the Turkish
Basketbol Süper Ligi (BSL). He renewed his contract with the team on September 10, 2025, signing a new one-year deal. ==Career statistics==