As baseball enters June, the Red Sox, Indians, Astros, Braves, Brewers and Rockies might feel like they're sitting pretty, holding the division lead as the season enters the summer months.
But the longevity of that divisional prowess is not a given.
Since 1996, the first full season with at least one wild card, 76 of 132 division winners (58 percent) held at least a share of the division lead entering June 1.
Historical trends
Does it feel like there are more good teams and more bad teams this year than in recent memory?
• There are two teams with winning percentages above .