The Chicago Cubs enter Monday's game against the St. Louis Cardinals with a 12.5-game lead in the National League Central, making them just one of four teams in the divisional era (since 1969) to hold a lead of 10 or more games by June 19, per Elias Sports Bureau (via ESPN Stats & Info).
The 2001 Seattle Mariners had a whopping 19.5-game lead in the AL West at the same point in the year, while the 1999 Cleveland Indians (11 games) and 1986 New York Mets (10) also boasted double-digit advantages over their nearest divisional competitors.