Muguruza kept putting pressure on Kvitova's service game, and the Czech needed to save two break points
again in the seventh game before holding her serve.
The Croat hung on and even had a chance to take the lead, but squandered three break points
of his own with the score tied at 5-5 in the first set.
Konta was yet to earn a break point
in the set but her first was a match point at 9-8 after a Vekic forehand drifted long.
However, Murray slipped up in the 11th game and a wayward forehand down the line offered his rival a rare break point
which he gratefully seized.
Williams grabbed a third break point
- so Watson blasted an ace.
Murray saw off two break points
then got on game point but ballooned a forehand long and was clearly irritated with himself.
Cilic crafted two break points
for himself, but Murray saved both before breaking for a third successive time.
Djokovic spurned another break point
in the seventh game when he returned long and he vented his frustration by yelling and striking the net with his racquet, but in the end Djokovic battle through to the semi-finals.
Murray served three aces in winning the first set, taking his only break point
and saving two on his own serve.
Ferrer will be wondering what if after converting just one out of 10 break point
chances, but has another opportunity to himself qualify for the knock-out phase when he takes on Janko Tipsarevic on Saturday.
He broke the Serb in his first service game and then saved a break point
in the 10th game before clinching the set when Tipsarevic netted a forehand.
The Olympic champion forced a break point
as early as the third game but was unable to convert that opportunity.
Ferrer converted another break point
when Nadal double-faulted to lead 5-4, but then hit wide on serve to be broken after Nadal's incredible scramble had set up the break chance.
Murray, chasing his third title of the season this week, looked solid in the opening set, never ceding even a break point
as he cantered to the opener on the back of a lone break of his opponent.
CLSI issued new intravenous penicillin resistance break point
standards in 2008.