Sherbini won a very tight battle by 11-7, 9-11, 7-11, 11-6, 11-8 against 18-year-old Nouran Gohar.
In the deciding game Sherbini was warned for a collision early on, and then frustrated by a controversial "no let" decision which helped Gohar to reduce a three-point deficit to one at 6-7.
It was still one point, at 7-8, when Sherbini pointed out that for the second time in the tournament Gohar's badly cut knee had started bleeding again.
She was obliged to leave the court to have it bandaged, bringing a nine-minute delay.
On resumption Sherbini produced a brilliant forehand counter-hit and then two more heavy, accurate forehand drives to close out the match.
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