He was also the last Orioles pitcher to appear in a major-league contest at Memorial Stadium.
But, they said, the Bush administration has proposed new warning labels solely because of political pressure since the death of the Orioles pitcher.
Mussina became the first Orioles pitcher to get a hit in nearly 25 years.
One red flag was raised in the third inning, when Benson touched Martínez for the first home run by an Orioles pitcher since 1972.
Jesse Orosco, the third Orioles pitcher, got the final out in the 10th and the victory.
"There's not a lot of room for error from either team," said Jeff Ballard, the Orioles pitcher.
It was the first complete game shutout of his career and the first complete game by an Orioles pitcher in the 2012 season.
Kevin Hickey (1-0), the third Orioles pitcher, pitched two innings for his first victory since 1983.
Mark Williamson (6-2), the fourth Orioles pitcher, got the victory.
His ERA led all Orioles pitchers that season.