Austrian tennis star Dominic Thiem shocked the tennis world when he defeated Rafael Nadal in the Australian Open quarterfinals. Thiem now faces Alexander Zverev in the semis today to get a chance to go up against Novak Djokovic in the final. We take a look at Thiem's career as well as get a taste of his romantic side with girlfriend Kristina Mladenovic. (Images courtesy: Dominic Thiem and Kristina Mladenovic Instagram)