San Francisco Giants outfielder Lee Jung-hoo has extended his hitting streak to a new career-high 15 games. Lee batted 1-for-4 with an RBI as the Giants edged out the Chicago Cubs 2-1 at Wrigley Field in Chicago on Sunday (local time). Lee's batting average for the season is now at .323, the fourth-best mark in Major League Baseball (MLB). During his 15-game run, the longest active hitting streak in MLB, Lee is hitting .483 (28-for-58) with only…