2019 buhari will defeat any presidential candidate osinbajo boasts

I think there may be some confusion here. Vice President Yemi Osinbajo did not make a statement saying that President Muhammadu Buhari would defeat any presidential candidate in 2019. In fact, the 2019 presidential election in Nigeria took place on February 16, 2019, and Buhari won the election, defeating his main opponent, Atiku Abubakar of the Peoples Democratic Party (PDP).

It's possible that you may be thinking of a different statement or quote from Osinbajo or Buhari, but I couldn't find any evidence of such a statement. If you could provide more context or clarify what you're referring to, I'd be happy to help you further.