Back-to-back four-strikeout games is apparently what it took for the Minnesota Twins to finally pull the plug and send Matt Wallner to Triple-A. The Forest Lake native has been striking out at an alarming rate all season, and consecutive 0-for-4 performances with eight combined strikeouts over the last two games have led to the Twins optioning him and relief pitcher Travis Adams to the St. Paul Saints on Thursday. Right-hander Zebby Matthews, who will start Thursday's game against the Marlins, and outfielder Ryan Kriedler have been called up to the big-league roster. Twenty-five players in the big leagues have struck out at least 50 times this season, and Wallner ranks 15th with 53 strikeouts. But he's reached that level in only 120 at-bats, while 23 of the other 25 players have between 139 and 183 at-bats. The only player with at least 50 strikeouts who has fewer at-bats than Wallner is Milwaukee's Garrett Mitchell, who has 52 strikeouts in 112 at-bats.…