Watford manager Walter Mazzarri has urged Nigerian striker Isaac Success to justify his inclusion in the starting lineup against Middlesbrough. <br /><br />With the 20-year-old preferred ahead of compatriot Odion Ighalo, the Italian coach is eager to see how he performs from the blast of the whistle, having starred in five consecutive cameo appearances.<br /><br />Mazzarri stated : &ldquo;We have given Success this chance and now it&rsquo;s up to him to show us on the pitch. I&rsquo;m very curious to see how we do.&rdquo;<br /><br />In his previous matches in the English top-flight, Isaac Success accumulated 98 minutes of game time and was cautioned once, against Burnley. <br /><br />He penned a five-year deal with the Vicarage Road outfit in July 2016.<br /><br />Igho Kingsley <br /><br />