All he has to do is run for his life and jab to the head and body and then keep his guard up whenever Pac comes in. He should also clinch whenever possible. The problem is Pac can feint and move into position with a punch from an angle. Which might throw Algieri off his rhythm. If Pac still has his elite level skills then it should be a comfortable night for him but if he's diminished and lost those skills then he could end up looking really bad.