have a prayer

not have a prayer

to be not at all likely to succeed (often + of ) She hasn't a prayer of winning the competition.
See also: have, prayer
References in periodicals archive ?
USC might be an underdog for most of its final six games, but it's unfair to say the Trojans don't have a prayer.
The Braves didn't appear to have a prayer after Ken Caminiti and John Vander Wal each smoked Atlanta ace John Smoltz for two-run homers as the Padres took a 4-2 lead into the seventh inning and trotted out their ace, Kevin Brown, for a rare relief appearance.