Ramirez hit .393 (11-for-28) with the six homers, 10 RBIs and a 1.071 slugging percentage over the eight games, and the 33-year-old was also tied for first in the NL with nine runs scored.
He began the week with his 24th career multi-homer game on June 27 against the Rockies as part of a 3-for-4 outing. On Thursday, his game-tying home run in the bottom of the ninth against the Giants helped the Cubs to an eventual 5-2 extra-inning victory in the rubber match of the three-game set against the defending World Champions.
He also had a walk-off pinch-hit single in the ninth inning Wednesday and smacked his 300th career home run on Friday.
The right-hander is batting .295 this season with 12 home runs and is tied for the club lead with 44 RBIs. The Cubs are back in action Tuesday night against the Nationals.
It is Ramirez's fourth career weekly award, the most recent coming in July 2010. He was also honored in May 2001 and July 2005.