Sykes scored 19 points after halftime for the second straight game. Over Green Bay’s past three games, he’s averaging 17 second-half points. The Phoenix (15-12, 9-5) trailed after halftime in each of those, including 36-35 with 16:35 remaining Sunday.
Alec Brown put Green Bay ahead 37-36 with a dunk, sparking a 15-3 run that included six points from Sykes.
Brown scored 16 points and Jordan Fouse added his third double-double of the year with 10 points and 10 rebounds for the Phoenix.
Green Bay shot 52.1 percent (25 of 48) from the field and 85 percent (17 of 20) at the foul line.
Bobby Hain led the Penguins (15-12, 7-7) with 14 points and eight rebounds. Kendrick Perry added 13 points, Kamren Belin 12 and Blake Allen 11.