As the Race to London hots up, Alexander Zverev and Kevin Anderson had contrasting results on Thursday.
Dominic Thiem said he was lucky to beat Daniil Medvedev in his homeland to reach the last four in St. Petersburg.
The top half of the men's quarter-final draw was completed on Sunday, with Rafael Nadal and Juan Martin del Potro among those to progress.
Having scraped through to the last eight of the US Open with a tired display, Rafael Nadal knows the time for improvement is now.
As in the third round, Rafael Nadal required four sets to come through a testing encounter with Nikoloz Basilashvili at the US Open.
Hasrat pemain tenis wanita Thailand, Luksika Kumkhum, untuk menempatkan diri dalam kelompok 16 terakhir Terbuka Australia 2018 lebur apabila tewas di tangan Petra Martic dalam kategori perseorangan wanita.