Zheng, the world number 35, edged an epic 65-minute first set in a thrilling tie-break.
But the Swiss pair breezed through the ensuing tie-break 7-1 to move within one set of victory.
Morgan, ranked fourth, survived a first set tie-break to defeat Brazilian Thiago Moura Monteiro 7-6 (7-3) 6-4.
The duo traded breaks twice in the second but though Williams edged ahead 5-6, Craybas forced the tie-break.
Philippoussis finally cracked when he double-faulted at 5-5 in the third set tie-break to hand Ferreira match point.
And Ilhan went on to take the third set in style with a 7-0 whitewash in the tie-break.
With service dictating, the Canadian and Serbian looked in trouble in the tie-break before edging the first set.
The Scot then dominated the tie-break, despite an angry outburst at 2-0 when he felt a call of "Allez!"
The match then went into a deciding tie-break, which Lee wrapped up 7-4.
But after a break of serve apiece, Nalbandian dominated the tie-break and took it with a sweeping forehand pass.
Again, there seemed to be no let-up with service as the opening tie-break went to 4-3 without any surprises.
Wilkstrom and Olsson, both making their Wimbledon debuts, took a 6-5 lead before the French pair forced a tie-break.
Parmar then thumped down two aces to take the set to a tie-break.
Though top seed Federer achieved his 39th successive win, he lost a tie-break for the first time in 16.
But Dodig hit back with his first break of the match and the set eventually went to a tie-break.
This is used in the BBC tables as a tie-break measure for schools scoring the same results at GCSE-level.
The mistake heralds a run of four lost points that prove enough to take the match into a tie-break.
When he slipped a mini-break down in the tie-break it looked like the missed opportunitues would tell for Murray.
But the 26-year-old world number 70 crumbled as Federer upped his game to level and set up a tie-break.
Ferreira took the first-set tie-break 7-5 before Philippoussis took the second set 6-4 to send the match into a decider.
Sixth seed Pliskova, 18, came back from 4-1 down in the tie-break to seal victory in one hour 20 minutes.
Both players held serve to take the second game to tie-break, which Murray won after coming back from 4-1 down.
Fourth seed, Ivan Ljubicic , joined them when he lost a third set tie-break 11-9 to Russian Nikolay Davydenko .
Inside the 'bull' is a smaller ring (the V-bull) which acts as a tie-break when scores are level for all positions.
Murray's volatile temper showed itself once again when he was given a code violation for foul language during the first-set tie-break.
Federer then dominated the tie-break, a forehand return and a drop shot helping him win five of the last six points.
The Czech player was even more at ease in the second tie-break, winning it with the loss of just two points.
Eventually it needed a tie-break, won by the Lithuanian, to separate the pair, with the last three points all Ward errors.
The second set also looked like going to a tie-break but at 6-5 Novak broke Henman to claim a semi-final berth.
Haas, 41st in the world, broke once in the first set first and then held his nerve in the second-set tie-break.
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