The sample size for James Borrego as an NBA head coach isn’t large: the last 30 games of the Orlando Magic’s 2014-15 season.
Borrego was interim coach after Jacque Vaughn was fired. The Magic’s record was 10-20 in that span, about the same winning percentage as Vaughn’s over the previous 52 games.
But there was a difference with Borrego, the Charlotte Hornets’ pick to be their next coach: The Magic was typically more competitive in that span, the most measurable improvement being on defense.
The standard measure for efficiency in the NBA, whether offensive or defensive, is points scored or allowed per 100 possessions.