article_snippet: USA's Donald Young stretches to return a shot to Ivo Karlovic during the Delray Beach Open on February 22 .
article_snippet: John Isner of The United States plays a backhand during John Isner of the United States third-round match at the Australian Open 2015 .
article_snippet: Spain's Rafael Nadal returns a ball against Argentine Juan Monaco during the final of the ATP Buenos Aires . '
article_snippet: Despite a shock defeat to 18-year-old Borna Coric in Dubai last week, Isner will be expected to win both Isner singles matches in Glasgow.