Marc Polmans, with Andrew Whittington, reached the semi-final of a tennis tournament where who were the defending champions?
Marc Polmans Marc Polmans (born 2 May 1997) is a South African born Australian tennis player. Polmans won the 2015 Australian Open – Boys' Doubles title with fellow Australian Jake Delaney, defeating Hubert Hurkacz and Alex Molčan in the final, 0–6, 6–2, [10–8]. He reached the semi-final of the 2017 Australian Open – Men's Doubles with Andrew Whittington.
2011 Serbia Open The 2011 Serbia Open (also known as "Serbia Open 2011 powered by Telekom Srbija" for sponsorship reasons) was a men's tennis tournament played on outdoor clay courts. The third edition of the event hosted by current Serbian player Novak Djokovic, it was part of the ATP World Tour 250 series of the 2011 ATP World Tour. It took place at the Tennis Center Novak complex in Belgrade, Serbia, from April 23 through May 1. Sam Querrey was the defending champion but hasn't entered this year.