21.   The Canadian-born Briton fired eight straight aces in his first two service games.

22.   The Canadian-born Brit fired eight straight aces in his first two service games.

23.   The German began the match by rifling four straight aces and he served with astonishing consistency.

24.   The top-seeded Chang started with four straight aces, relying less on speed than angles.

25.   When he fired four straight aces to close out the affair, he drew oohs and aahs from the spectators.

26.   His serve was powering along and he won one game in the second set with four straight aces.

27.   The fifth-seeded Croatian served himself out of trouble in the ninth game of the second set, finishing with two straight aces.