Mardy Fish says he declined interviews after his first-round match at Wimbledon because of a stomach problem related to pain medication he's taking for his right arm — and not anything related to his heart.

Fish spoke to reporters Wednesday, a day after he beat Ruben Ramirez-Hidalgo in three sets at the All England Club. It marked the 10th-seeded American's first match since a medical procedure in May to try to pinpoint an accelerated heartbeat.

It was his first competition in about 2½ months.

Fish is still working to get his confidence back with regard to his heart.

During a match, he says, "The more you keep your mind off it, the better."

Fish next plays 173rd-ranked British wild-card recipient James Ward.