Most polls show that Poroshenko appears to be in a dead heat for second place against former Prime Minister Yulia Tymoshenko.

The latest Rating Group Ukraine pollshowed both Tymoshenko and Poroshenko running neck and neck, each with support from 17% of likely voters.
Tymoshenko, twice a former Prime Minister, is a formidable opponent. The former head of an energy company in the 1990s, she came to power in 2007 following a wave of peaceful protests known as the Orange Revolution.
She left office in 2010 and was later jailed over a natural gas agreement that she signed with Russia, a sentence widely seen as political.
The only thing certain in Ukrainian politics is uncertainty. In contrast to neighboring Russia, where Putin won a resounding (and expected) victory in the polls last year, we don't know if the incumbent will come out on top.
"Democracy in Ukraine is messy & far from perfect, but it's competitive," former US ambassador to Ukraine Stephen Pifer wrote on Twitter on Tuesday. "We're 5 days from presidential election & less that 26 days from almost certain run-off, but no one knows who will win. In contrast, we knew in 2013 who would win 2018 presidential election in Russia."