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Rapid Reaction: Cubs 7, Cardinals 0

CHICAGO -- A quick look at the Chicago Cubs' 7-0 win over the St. Louis Cardinals in the series opener on Friday at Wrigley Field.

How it happened: Relative newcomer Jake Arrieta helped the Cubs end a four-game losing streak with seven innings of shutout baseball. Arrieta, acquired from Baltimore on July 2 along with Pedro Strop, allowed just two hits in his second start as a Cub. St. Louis starter Jake Westbrook walked the first three Cubs batters in the first inning and Nate Schierholtz made him pay, singling home two runs. Donnie Murphy's base hit added the third run in the first. The Cubs padded their lead in the middle innings, scoring once in the fifth, twice in the sixth and once more in the seventh. Arrieta has now logged 13 innings allowing one run and four hits in two Cub starts.

What it means: Before the game Cubs manager Dale Sveum said Arrieta will be in the rotation the rest of the season. … Scoring more than three runs a game has become a huge challenge in the post-Alfonso Soriano era. The Cubs had averaged just 2.7 runs since Soriano was traded on July 25 before Friday’s blowout. The Cubs have played the Cardinals tough this season. With the Cubs win on Friday, each club has won seven of the first 14 played in 2013.

Outside of the box: RHP Matt Guerrier had right forearm surgery on Friday in Cincinnati. Dr Tim Kremchek performed the surgery. Guerrier said on Wednesday that rehab will take 6-8 months. The veteran pitcher will be a free agent after the 2013 season. … Cubs pitcher Carlos Villanueva took the high road after getting sent to the pen when Arrieta was recalled. He acknowledged he was upset with the decision, but understands the player development period the Cubs are going through. Viilanueva said he might not have been in the proper state of mind when he allowed two runs in relief after getting the news of his demotion on Wednesday.

Up next: The Cubs send Travis Wood (7-9, 3.00 ERA) to the hill against St Louis’ Joe Kelly (3-3, 3.14).