Here is a list of all the Opening Day starters:
Arizona Diamondbacks - Dan Haren vs. Padres
Atlanta Braves - Derek Lowe vs. Cubs
Baltimore Orioles - Kevin Millwood vs. Rays
Boston Red Sox - Josh Beckett vs. Yankees
Chicago Cubs - Carlos Zambrano vs. Braves
Chicago White Sox - Mark Buehrle vs. Indians
Cincinnati Reds - Aaron Harang vs. Cardinals
Cleveland Indians - Jake Westbrook vs. White Sox
Colorado Rockies - Ubaldo Jimenez vs. Brewers
Detroit Tigers - Justin Verlander vs. Royals
Florida Marlins - Josh Johnson vs. Mets
Houston Astros - Roy Oswalt vs. Giants
Kansas City Royals - Zach Grienke vs. Tigers
Los Angeles Angels - Jered Weaver vs. Twins
Los Angeles Dodgers - Vicente Padilla vs. Pirates
Milwaukee Brewers - Yovani Gallardo vs. Rockies
Minnesota Twins - Scott Baker vs. Angels
New York Mets - Johan Santana vs. Marlins
New York Yankees - C.C. Sabathia vs. Red Sox
Oakland Athletics - Brett Anderson vs. Mariners
Philadelphia Phillies - Roy Halladay vs. Nationals
Pittsburgh Pirates - Zach Duke vs. Dodgers
San Diego Padres - Jon Garland vs. Diamondbacks
San Francisco Giants - Tim Lincecum vs. Astros
Seattle Mariners - Felix Hernandez vs. Athletics
St. Louis Cardinals - Chris Carpenter vs. Reds
Tampa Bay Rays - James Schields vs. Orioles
Texas Rangers - Scott Feldman vs. Blue Jays
Toronto Blue Jays - Shaun Marcum vs. Rangers
Washington Nationals - John Lannan vs. Phillies