Rockies Peter Lambert is making his third big-league appearance, his second at Coors Field. He is not going to overpower, but is an old-school pitcher with a feel for the game.
Margevicius is also a rookie, but has been in Padres rotation since start of season, and is making his third start of the year against the Rockies.
While the Padres will be facing Lambert for the first time, Margevicius is facing the Rockies for the third time this year. Colorado has had success again him.