Play gets underway at 4:00 p.m., when the top-seeded Czech duo of Adam Pavlasek and Patrik Rikl take on Britain's David Stevenson and Marcus Willis as they look to live up to their status as tournament favourites. Both teams have dropped just one set on their way to the final, setting the stage for what promises to be another high-quality contest.

For the first time in the history of the ATP tournament in Umag, dating back to 1990, none of the seeded players has reached the singles semifinals. Instead, the spotlight will be on four players who began the week as outsiders but have thoroughly earned their place in the last four with a series of impressive performances.

At 6:30 p.m., Argentina's Roman Andres Burruchaga (ATP No. 67) faces Spain's Daniel Merida (pictured, ATP No. 82) in an intriguing semifinal clash. Both players have already reached an ATP final this season—Burruchaga in Houston and Merida in Bucharest—and regardless of Friday's outcome, each is guaranteed to achieve a new career-high ATP ranking on Monday.

The second semifinal, scheduled for not before 9:00 p.m., sees Bosnia and Herzegovina's Damir Dzumhur (ATP No. 108) looking to go one step further than last year, when his run in Umag ended in the semifinals. This marks his ninth appearance at the Plava Laguna Croatia Open.

Following a gruelling three-hour-and-42-minute quarterfinal battle, Džumhur now faces Slovakia's Alex Molcan (ATP No. 101), who produced one of the tournament's biggest upsets by eliminating second seed Alejandro Davidovich Fokina of Spain, reminding everyone of the form that once saw him rise to World No. 38.