Green Bay held Loyola to 37% from the field, including 28% in the first half.
Fletcher scored 14 of his 21 in the second half as the Phoenix (9-9, 3-3HL) won its 3rd straight. Green Bay hosts Illinois-Chicago on Saturday.
In Milwaukee, the UWM Panthers knocked off Illinois-Chicago 87-75. The Panthers (9-9, 4-3HL) shot 54% from the field.
Tony Meier scored 22 points to lead the Panthers, who never trailed and led by as many as 23 points in the second half.