The only hit Baltimore pitchers allowed on Friday night in a game against the Boston Red Sox was a bunt single by Scott Podsednik to lead off the first inning. Podsednik ended up scoring on a sacrifice fly but the O’s ended up winning the game 9-1. The last player to get his only team’s hit on a bunt single to lead off a game was Cesar Tovar for the Twins at Washington’s RFK Stadium on Aug. 13, 1970. Tovar’s bunt single was the only hit off the Senators’ Dick Bosman, who outdueled Jim Kaat. Kaat allowed only five hits in a 1-0 Washington win, in a game that took only 2:02 to play. Box score of Twins/Senators game.
The Bosman game is a low-drama example, but Tovar supposedly holds the major league record for most times having the only hit in a game in which the pitcher threw a one-hitter. He did it five times. I don’t always trust Wikipedia, but this entry seems well-sourced. http://en.wikipedia.org/wiki/C%C3%A9sar_Tovar