CHICAGO — The Atlanta Braves are going to have to wait a little longer to come up with just their second winning streak this season. The Braves (5-18) wasted Freddie Freeman’s solo home run and a strong rookie pitching performance from Aaron Blair, as Matt Szczur’s eighth-inning grand slam led to a 6-1 loss to the Chicago Cubs. Blair, in his second major league start, showed little tension, completing six innings while giving up one run on two hits.