The odds on a Trump victory are 15/8, or 34 percent, putting the billionaire real-estate mogul as favourite in the market for the first time, Betfair said in an e-mailed statement in London on Wednesday. Previous favourite Marco Rubio widened to 11/5, or 31 percent, while Ted Cruz is 7/2, 22 percent. Betfair didn’t provide earlier odds in its e-mail.

“The market for Republican nominee has been the tightest betting contest in the 2016 presidential election so far,” said Naomi Totten, a spokeswoman for Betfair, in the statement.