Wiggins' selection marks the fourth straight year the Terps have had a player chosen in the NBA Draft.
Wiggins averaged 14.5 points, 5.8 rebounds and 2.5 assists per game last season and saw his NBA stock rise.
Ayala led all Terps in scoring with 15.1 points last season.
Morsell departs from the Terps after an historic season where he became the first Maryland player to win conference Defensive Player of the Year.
Martinez adds to the Terps' guard depth, while Hamilton was squeezed out of the rotation.
The junior led the Terps in scoring last season, averaging 15.1 points per game.
Wiggins earned all-Big Ten honorable mention honors last season.
Russell averaged 14.7 points, 4.5 rebounds and 4.5 assists with Rhode Island this season.
The Crimson Tide hit 16 threes to dash the Terps' Sweet 16 hopes.
“Our talent level’s not where it’s been. But our toughness is at an all-time high.”