Challenge of the Week #20 is an NL Central duel, as the Cardinals Ace faces first-time All-Star and center-fielder for the Pirates. Climb the leaderboard and get as many hits as you can for a chance to win your choice of a signed ball from one of six MLB stars – Hamels, Reyes, Posey, Upton, McCann, and Matsui.

Week #20 begins on Monday, July 18th at 5:30am PDT and ends Monday, July 25th at 4:30am PDT.

To play, simply select the “Challenge of the Week” option in the main menu of the game.

This week continues the July monthly prize period – $2000 in cold, hard cash. Every four weeks, a monthly prize will be awarded to the player with the most Challenge of the Week points. Weekly scores will also be added from May 30th until September 18th 4:30am PST for a chance to win Grand Prize #2, a Trip for two to a 2011 World Series Game!

Each user can only win each type of prize ONCE. Complete Leaderboards for Weekly, Monthly and Grand Prizing, along with the official rules can be found at the NEW home of MLB The Show at TheShowNation.com.