McManaman endured criticism after his controversial tackle on Newcastle's Massadio Haidara last month but savoured a special moment on Saturday as he celebrated the fierce drive from the edge of the box that was his first Premier League goal.
"He (McManaman) looked a real threat," Martinez said. "He wins the corner (from which Boyce scored his header), and then obviously the goal that he scores from open play is of a real, real talent.
"I asked them to do something very difficult and they mastered it. I couldn't be prouder."