LAS VEGAS (AP) — NBA Commissioner Adam Silver said Monday that he believes all leagues have to continue keeping an incredibly close eye on gambling trends within their sport, mindful of issues that the NFL in particular has had to address in recent months. Silver — who has been a longtime proponent of legalized sports betting frameworks within sports — spoke in Las Vegas, part of a moderated discussion as part of the Associated Press Sports Editors convention. He said he draws the analogy to insider trading, and how leagues, he believes, are finding ways to stay ahead of major problems.