Roger Federer cruised into the second round of the ATP Dubai Tennis Championships with a 6-1 6-4 win over Benjamin Becker.
Germany's Davis Cup captain Carsten Arriens was booed and jeered by home fans in Frankfurt on Sunday.
Round-up: Roger Federer and Stanislas Wawrinka gave Switzerland a 2-0 lead over last year's runners-up Serbia in the Davis Cup.
Donald Young has replaced the injured John Isner for the United States and will face Wimbledon champion Andy Murray of Britain.
Tomas Berdych will face David Ferrer in the Australian Open last eight after both men won on Sunday.
David Ferrer smashed a racket after losing his serve but reached the fourth round of the Australian Open with a 6-2 7-6(5) 6-2 win over Jeremy Chardy.
Round-up: David Ferrer battled his way into third round of the Australian Open with a 7-6(2) 5-7 6-0 6-3 win over Adrian Mannarino.
ATP World Tour Finals
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