He then calmly produced an ace for a second set point and profited from a long Burrieza return to collect early lead.
Schuettler served first and was quickly 0-40 down and though he delivered an ace on the first break point, there was no stopping Nadal.
It was a huge breakthrough for the fifth seed and he took full advantage by firing down an ace on his second set point to move into the lead for the first time.
Once again, his serve came to his rescue, a sixth ace earning him a fourth set point and Federer obligingly put his return wide to hand Murray the set.
Although she double-faulted on her first match point, she then served an ace on her third to win.
The sixth-seeded American -- who had not won a Masters title on the ATP Tour for four years -- fired 13 ace and did not face a single set point in a 7-5 6-4 win.
There was no sign of that injury in the opening game as the huge, flat forehand that did for Federer in New York earned Del Potro an early break point, but Murray saved it with an ace and then took control.
Moments later, Murray double-faulted for the first time to give Federer a break-back point in game eight, but he responded brilliantly with an ace out wide and the danger had passed.
BBC: Andy Murray beats Roger Federer to win Shanghai Masters
Hs patient baseline game helped earn him the first set point at 5-4, only for Gulbis to fire a huge ace out wide.
Clijsters raced to a 5-1 lead, helped by her first ace of the match -- coming off a second serve -- but then missed three match-point chances at 6-3.
They also have an ace up their sleeve, a trump card that puts a giddy spin on the third act at just that point where both the previous movies began to run out of stream.
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