LOS ANGELES (Variety.com) - A disastrous domestic summer box office is ending on a low note.

Without any fresh competition in wide release, "Guardians of the Galaxy Vol. 2" each stayed first for two frames.

But while the action comedy is certainly profitable at this point, its threepeat is less due to the movie's overwhelming popularity, and more attributable to the lack of alternatives. This -- the first Labor Day weekend in recent history without a new wide release -- is tracking to have the lowest four-day total for the holiday in nearly two decades. The 28 movies currently in release are tracking to bring in about $94 million. Not since 1998 when "There's Something About Mary" led the box office with $10.9 million* and all 29 movies in release earned $78.8 million has the holiday weekend dropped so low.

Of the weekend's two medium-sized launched, Sony's re-release of "Alicia Vikander is expected to earn $1.5 million from 765 locations.