Stan Wawrinka returns to the semifinals in this tournament for the second time in his career. He reached the semifinals here in 2013. It's also his 5th trip to the semifinals in all the grand slams.
Here was his path to the quarters -
1R: Albert Ramos-Vinolas (ESP) (#58)
2R: Hyeon Chung (KOR) (#69)
3R: Ruben Bemelmans (BEL) (#107)
4R: Donald Young (USA) (#68)
QF: Kevin Anderson (RSA) (#14)
SF: Roger Federer (SUI) (#2)