What is another word for one-horse race?
Pronunciation: [wˈɒnhˈɔːs ɹˈe͡ɪs] (IPA) 
The phrase "one-horse race" refers to an event that is predictable and lacking in competition. However, there are several alternative expressions that can also describe a similar idea. For instance, "walkover" denotes a situation where one party in a competition has no serious opposition. "Foregone conclusion" speaks to a predictable outcome that was known all along. "Blowout" refers to a complete and decisive victory in a game, match, or election. "Cakewalk" signifies an easy victory or accomplishment that required little effort. Finally, "shoo-in" depicts a person or team that is presumed to win comfortably. These and other related terms can be used interchangeably, depending on the context and tone of the situation.
