Mike Gonzalez came on to pitch in the sixth inning today, and all three of the batters he faced reached base. Though he did not allow a run himself, the three runs that did score in the inning were charged to him, giving him an infinite ERA. He is the sixth player in franchise history to open the season with an infinite ERA. Here is the full list:
| Player | Year | Date | Opponent | Line |
| Mike Gonzalez | 2013 | April 2 | Colorado Rockies | 0 IP, 2 H, 1 BB, 3 R, 3 ER |
| Carlos Villanueva | 2007 | April 4 | Los Angeles Dodgers | 0 IP, 0 H, 3 BB, 3 R, 3 ER |
| Rollie Fingers | 1984 | April 3 | Oakland Athletics | 0 IP, 3 H, 0 BB, 3 R, 2 ER |
| Fred Holdsworth | 1980 | August 4 | Boston Red Sox | 0 IP, 1 H, 1 BB, 2 R, 2 ER |
| Frank Linzy | 1973 | April 7 | Baltimore Orioles | 0 IP, 1 H, 2 BB, 1 R, 1 ER |
| John Gelnar | 1970 | April 7 | California Angels | 0 IP, 3 H, 0 BB, 4 R, 3 ER |
He is also the fourth pitcher in MLB to have an infinite ERA to start the 2013 season. The other three: Chad Durbin (Philadelphia), Santiago Casilla (San Francisco), and Fernando Salas (St. Louis).