The French saved two break points in the fifth game of the third set but dropped serve
in the seventh against an ecstatic Belgian pair.
The warning signs were there for Raonic when he dropped serve
in the third game of the match under grey skies on Court Suzanne Lenglen and he effectively surrendered the opener when he was broken again at 1-3.
In the final match of the opening set, Ivanovic fell behind 40-0 and dropped serve
on double-fault while Williams served 12 aces.
Kuznetsova, the seventh seed, dropped serve
in the sixth and eighth games and went down to the loss on the first of two match points for her Spanish opponent.
After breaking Murray to get a chance to serve for the match and a spot in the Australian Open semifinals for an 11th consecutive year, Federer dropped serve
He was quickly tackled by security staff and wrestled to the ground, but Nadal appeared shaken as he promptly dropped serve
Despite coasting through the first set, she then dropped serve
for the first time in the tournament, being broken three times in the second set, trailed 0-2 in the third and fought off two break points that would have seen her slip to 0-3.
The British number two held serve twice but, once she dropped serve
for the first time in the sixth game with a poor drop shot, the floodgates opened.
The third seed promptly dropped serve
again at the start of the second set but drew level again in the eighth game at 4-4.
Neither player had dropped serve
all week but Djokovic started sloppily, with Federer breaking in the opening game.
She dropped serve
three times in a row to hand her opponent the first set.
The two opponents were otherwise evenly matched, but Dimitrov's mistakes often resulted in dropped serve
and Wawrinka handily won in straight sets.