Ohio University's Jake Percival has been named the Mid-American Conference Wrestler of the Week.    Percival won all four of his matches on his way to a championship at 157-pounds in the MAT Town USA Invitational. In the opening round, he defeated Joey Hooker by a 21-7 count. In the quarterfinals, Percival knocked off James Woodall from Penn State 9-5. In the semifinals, the junior knocked off Charlie Brenneman by a 10-5 margin. In the championship match, Percival defeated No. 13 nationally ranked and 2003 NCAA qualifier Scott Roth of Cornell    It was the first Open Percival has won at his new weight class.