Milos Raonic and Dominic Thiem will meet in the Indian Wells Masters semi-finals.
Untroubled at the Indian Wells Masters, Roger Federer and Rafael Nadal are on track for a 39th meeting.
German third seed Alexander Zverev was stunned by countryman Jan-Lennard Struff in straight sets in the third round on Monday.
The first day of the 2019 Dubai Tennis Championships saw Roger Federer advance while Milos Raonic and Karen Khachanov were eliminated.
Having lost to Milos Raonic at the Australian Open, Stan Wawrinka overcame the Canadian in Rotterdam to reach the quarter-finals.
Having beaten Stan Wawrinka in the Rotterdam Open last year, Tallon Griekspoor added the scalp of world number 11 Karen Khachanov.
After exiting the Australian Open at the hands of Lucas Pouille, Milos Raonic may have to miss the Davis Cup due to an ongoing knee problem.
Lucas Pouille produced an upset win against Milos Raonic in the Australian Open quarter-finals.
Lucas Pouille concedes that even he did not expect to reach the semi-finals of the Australian Open.
Pablo Carreno Busta and Alexander Zverev's frustration got the better of them as they suffered contrasting Australian Open exits.