Georgia coach Mark Richt can preserve state bragging rights for the Bulldogs in Saturday's game. Georgia is 11-1 in the rivalry under Richt. Its only loss in that span came in 2008, Johnson's first season.
Johnson would earn high marks for his second win in six tries against the Bulldogs.
Georgia Tech and Georgia share identical 7-4 records, so the game will help define each team's season.
Mason, a fourth-year junior, was held out last season as a redshirt and has had only limited playing time behind Murray. He said he still worked as if he would start so he wouldn't be caught unprepared if his opportunity arrived.
"That's one thing I challenged myself to do, to always prepare because you never know when your opportunity is going to come," Mason said. "I wanted to make the most of it because I knew my opportunity was short, that window was short."
Georgia Tech is led by first-year starter Vad Lee, who has had more modest passing numbers than many expected. He has completed only 47.1 percent of his passes (66 of 140) for 1,182 yards with eight touchdowns and seven interceptions.
Lee has helped keep a balanced running game productive in Johnson's spread-option offense.
Georgia beat the Yellow Jackets 42-10 last year in Athens, but Richt wouldn't say his Bulldogs have dominated the series.
"Well we've won most of the games, but I don't know if I'd say that we've taken it over," Richt said. "There have been so many close games, and we've been able to win the close games — most of them.
"I think our guys understand how important this game is. I don't know if we've had a game where I'd say that we came out flat. I think we're playing our best football when we play Georgia Tech. A lot has to do with wanting to honor our seniors with the way that we finish as a team, and I think a lot of it is that most of our guys grew up in Georgia and understand it."