McCullers faces A's on Robinson Day

McCullers faces A's on Robinson Day

The Astros and A's are set to take part in a league-wide celebration of Jackie Robinson during Saturday's matinee at the Coliseum, celebrating the 70th anniversary of the pioneer's MLB debut.

Robinson has been immortalized for his efforts as the first African-American player on a big league roster, withstanding racism and immense scrutiny throughout his Hall of Fame career. His legacy will continue to be championed on Saturday, as players across MLB will all be wearing No. 42 jerseys in his honor.

Fans in attendance will also be treated to a showdown of a couple of the American League West's top young pitchers. A's southpaw Sean Manaea (0-1, 7.15 ERA) and Astros righty Lance McCullers Jr. (1-0, 2.77) are slated to duel in another anticipated pitching matchup, a day after aces Kendall Graveman and Dallas Keuchel battled on the mound.

While McCullers, 23, has started the year strong with a couple of quality starts and 17 strikeouts in 13 innings, Manaea has been knocked around a bit to begin 2017. The 25-year-old has allowed eight hits and four walks over 11 1/3 innings, and has allowed 10 runs (nine earned).

"We know that Manaea is going to pitch a lot better," A's manager Bob Melvin said. "He's actually pitched a lot better than his numbers would indicate."

Things to know about this game

• A's slugger Khris Davis feasted on American League West competition in 2016, bashing 25 homers against division foes, but just one of them came against the Astros. He didn't wait long to match his total against Houston, hitting a solo shot against Dallas Keuchel on Friday night.

• The Astros are just 2-4 this season when facing left-handed starting pitchers

• Manaea is yet to record a win against the Astros, despite posting a 1.69 ERA in four starts against Houston as a rookie last year

Alex Espinoza is a contributor to MLB.com, based in the Bay Area. This story was not subject to the approval of Major League Baseball or its clubs.