Friend of the blog Alex Speier from WEEI.com did some Baseball-Reference.com research and found out that Joba is only the fifth pitcher since 1954 to go less than six innings and strike out 12.
Kevin Appier (Royals vs. Rangers, June 25, 1994): Struck out 13 in 5.2 innings.
J.R. Richard (Astros at Cardinals, June 9, 1978): Struck out 12 in 5.1 innings.
Curt Schilling (Phillies at Braves, June 28, 1997): Struck out 12 in 5.2 innings.
Cole Hamels (Phillies vs. Braves, July 24, 2006): Struck out 12 in 5.1 innings.
Hamels and Schilling lost, too. Richard and Appier won.
UPDATE, 12:43 p.m.: Peter Hirdt from Elias e-mailed to say that these are the only five players in baseball history to do it. Pretty amazing.
UPDATE, !2:57 p.m.: More from Elias:
Only two other pitchers since 1900 struck out as many as 12 batters in a game in which they allowed four or more runs in the first inning: Herb Score (14 SO in 1959) and Nolan Ryan (13 SO in 1973).
Nine of his 12 strikeouts were on called third strikes, the most in one game since September 2, 2001, when Mike Mussina recorded nine called strikeouts in his near-perfect game against the Red Sox.