Hewitt wound back the clock and knocked out number 6 seed Del Potro.
Led 5-2 in the 4th but blew it and then lost the tie break.
Looked like Hewitt was gone but he crushed Del Potro 6-1 in the 5th.
Now has a good shot at getting to the 4th round in what has been another ordinary slam for the Aussies so far