He hit the line a few time in the third set tie-break
," Krajinovic, the world number 34, told reporters after the heart-breaking defeat.
The Iranian tallied seven points to tie with IM Shen Yang of China, but had a better tie-break
of seven wins against five for the Chinese silver medallist.
Despite missing a chance to serve for the fourth set, the South American fought through for a second tie-break
But there was no repeat of the tight first set tie-break
second time round, as Murray charged into a 5-1 lead and eventually converted his second match point at 6-2 with a backhand pass for a satisfying 7-6 (13/11) 7-6 (7/2) win.
But Tomic and Barty battled back to win the second set 10/8 on a tie-break
That meant a super tie-break
was required to settle the match and Bhupathi and Bopanna seized control, racing into a 9-4 lead before sealing the win on their second match point.
Robson's untimely double fault allowed the Germans to break back for 4-4, but the teenager saved a set point in her next service game to take the set into a tie-break
Mirnyi saved one set point at sudden-death deuce at 4-5, then the Belarusian-Canadian duo took early control of the tie-break
to clinch the 47-minute opener.
The Serb then wasted two match points in a thrilling third-set tie-break
before eventually sealing a 7-6 (7/4) 6-2 6-7 (11/9) 6-3 victory.
Davydenko dropped the first set in a tie-break
to France's Florent Serra but hit back to take the next two 6-4 6-1.
After losing the tie-break
7-3, Dimitrov capitulated and allowed his opponent to take a 5-0 lead in the second set, which Amritaj won 6-1.
The second seed took a topsyturvy first set on a tie-break
and battled back from a break down to seal a meeting with Frenchman Marc Gicquel in the last eight.