Accardo and Cain were Minor League roommates during their days together coming up through San Francisco's farm system. They were teammates at High Class A San Jose and Double-A Norwich in 2004 and both played for Triple-A Fresno in 2005.
Accardo and Cain each broke in with the Giants during the 2005 season as well.
"I'm just happy for him," Accardo said on Thursday morning. "It couldn't happen to a better person or a more deserving person. Numbers-wise, he's one of the best pitchers in the game year in and year out."
Cain's masterful performance on Wednesday marked only the 22nd perfect game in baseball history. The Giants' right-hander struck out 14 in the outing, which Accardo viewed as just another example of how Cain has grown as a pitcher over the years.
"When we were coming up," Accardo said, "Cain and I, and a lot of the guys at the same time, we were hard throwers. Eventually, you kind of lose that velocity, but you also learn the knowledge of actually pitching and being able to miss barrels and getting people out.
"The way he approaches the batters, he makes the plate get bigger. It's sinking, it's backdoor, all that stuff. He's just lights out."