Del Potro walked with a weeping Almagro towards the umpire's chair and after the Spaniard officially retired, the two shared a hug. "I think the surprise of knowing what you are going to have on that very special day you give birth is prob the best surprise you can ever have, " Serena wrote, then went on to "clarify what Venus said".
The match was locked at 1-1 after Del Potro had taken the first set 6-3 before Almagro claimed the next by the same score. He now faces World no.1 Andy Murray in the Round of 32.
A knee problem suffered in Rome earlier this month left him with no option but to retire and, for a player whose career has been beset by injuries in recent years, it was a bitter blow.
Afterwards, Del Potro revealed afterwards that he encouraged him to think of his family and his new-born baby.
But the 29th seed, whose loss to Gastao Elias in Lyon last week was his only defeat this season to a player outside the top 10, knows he must quickly re-focus for his showdown with Murray.
"I know how sad (he) could feel. after an injury, because I had a lot", del Potro said.
His opponent Nicolas Almagro collapsed to the court in tears at 1-1 in the third set after succumbing to injury before Del Potro quickly hurdled the net to console him.
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"I wish you a speedy recovery".
Murray lost the opening set on a tie-break but recovered to win 6-7 (3-7) 6-2 6-2 7-6 (7-3).
"The second and third set was not easy, but I was ready with my game at the important moments when I needed, and it worked really good".
Murray had said he would be ready for any such antics, but the world No 1 was consumed by his own frustration as he got bogged down in the fourth set.
Former British number one Greg Rusedski, commentating on the match for Eurosport, believes Murray will need to improve to beat Del Potro.
There are few things Murray enjoys more than proving people wrong, and every set he gets under his belt here at the French Open will increase his belief that he is beginning to find his form at the right time.
Aussie bad boy Nick Kyrgios saw his French Open run halted after losing 5-7, 6-4, 6-1, 6-2 to big-serving Kevin Anderson of South Africa.
The 25-year-old Czech faces Russian world 86 Ekaterian Alexandrova who has never beaten a top five rival. Andy is one of the favorites to win this tournament.
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