The Spanish second seed has been taking antibiotics to delay the need for surgery and was relieved to emerge unscathed from his match against his Italian opponent.
"I had some doubts that I would be able to compete well," the former world number one told reporters.
"Today was a very positive victory for me. I'm very happy for what happened. With my summer-long wrist injury and now the appendix, it's not been a great season. This was a dangerous match for me and I won it,” the said.

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