The Atlanta Braves topped the Cubs on Tuesday night in large part due to one player finally breaking free of a tough start to the season. Mike Yastrzemski’s struggles were one of the few disappointing things the Braves had to endure through the opening month of the season. The outfielder entered Tuesday’s game slashing .200/.264/.252 with six RBIs over 115 at-bats.  On Tuesday night, Yastrzemski was the hero that the Braves needed.  He went 2-for-2 with three RBIs in the Braves’ 5-2 win over the Cubs, and he snapped a streak of 37 straight games without a home run to start the season (second-longest drought of his career).…