Rookie Rick Porcello takes the mound this afternoon in Toronto for his first major league start.
Jays lefty Ricky Romero is also scheduled to make his MLB debut. According to the Free Press, "Since 1901, there have been 18 games in which both starting pitchers were pitching in the majors for the first time. One of those 18 games involved the Tigers' Denny McLain. Not only did he go all the way to win his debut in 1963, but he homered off his fellow debuting starter, the White Sox's Fritz Ackley."
For what it's worth, Porcello attended Seton Hall Prep in New Jersey and I attended Seton Hall University. He's from Morristown, NJ, and I lived in nearby Mendham, NJ, for for years.