The first days of competition continued to be marred by problems at the newly built venues.
Two baseball games were postponed because of problems with the temporary stadium's illumination system. The Mexico-Venezuela match was suspended in the ninth inning with the game tied 2-2 because of lack of natural light.
In a day game, Panama upset Cuba 4-3. The Cubans have won the last nine Pan Am titles.
Problems with the broadcast cables at another new venue, the Rio Multisport Arena, led to the delay of television coverage of the men's team gymnastics competition.
The mountain bikers had problems practising at the Morro do Outeiro circuit on Friday because of heavy rains and the lack of emergency medical personnel.
The problems could hurt Rio's hopes of hosting the 2016 Olympics.
The city has officially bid for the event and the Pan Ams are seen as a test of Rio's readiness.
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