And the Croatian proved unable to repeat the feat on Wednesday, losing 7-6 (7-5) 7-6 (7-5) 6-3 to another Argentine in Zeballos, who goes on to face David Goffin in round three.
American Steve Johnson, still grieving the recent death of his father, advanced to the third round by beating Borna Coric Croatia 6-2, 7-6 (8), 3-6, 7-6 (6) in a hard-fought emotional match.
This is published unedited from the ANI feed.
The second seed plays Argentina's Diego Schwartzman for a place in the last 16.
After dropping the opening set against Kontaveit, Muguruza was down a break in the second before coming back.
As we mentioned before for the first time in several years, we can't detect any massive favorite and like never in the previous 6 or 7 contests here, the competition is exciting regarding the final victor. That was interesting. He tried to do what you need to do to beat Rafa... not just try to play your best - because if you just do that, you're going to lose.
In other another important clash, 11th seeded Gregor Dimitrov defeated veteran Spanish player Tommy Robredo in straight sets 6-3, 6-4. 7-5.
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Haase began to dig in more and more in the final two sets, taking a creditable four games off Nadal in the second set but again, without ever threatening the world No. 4's chances in the match. It's obvious that I can not miss the clay-court tournaments.
Djokovic is trying to become the first man in the Open Era to capture each of the four Grand Slams twice.
Williams, who was runner-up in 2002, made it past the second round for the first time in five years.
Tsonga had just broken back to trail 5-4 in the fourth set and by two sets to one, meaning he immediately had to serve to stay in the match when it resumed on Wednesday. Olivo converted the next one with a forehand crosscourt victor and to win 6-4.
But before contemplating their respective accomplishments, each man had a second round match to attend to, with the shock early exits of seeded players including Alexander Zverev (9), Jo-Wilfried Tsonga (12) and Jack Sock (14) offering timely reminders that neither Nadal or Djokovic can afford to count their chickens just yet. I think something different in a good way.
Venus Williams got off to a sluggish start but quickly found her range to beat Kurumi Nara of Japan 6-3, 6-1 and reach the third round of the French Open.
Defending champion Novak Djokovic is also on the bill, facing Joao Sousa on Court Suzanne Lenglen.