BOGOTÁ, Colombia – After a rainy day in Bogota, defending champion and No.2 seed Teliana Pereira fell to Argentine qualifier Catalina Pella 3-6, 6-3, 7-6(3) in the first round of the Claro Open Colsanitas.

Pereira, who became the first Brazilian to win a WTA title in 27 years when she won her first singles title here in 2015, seemed primed to make another deep run when she quickly took the first set off her 23-year-old opponent. But a three-hour rain delay halted the match just as Pella won the second set, breaking up Pereira’s rhythm and allowing Pella the time to find her nerve.

“I was so, so, nervous,” Pella said after the match. “It was really tough also because she has a lot of experience – I don’t.”

After coming back from the delay at 2-1, 40-40 in the final set, Pella’s inexperience showed as she hit a double fault to give Pereira a break opportunity, which the Brazilian took handily. Pella later squandered another lead – this time at 5-3.

“I felt totally paralyzed,” Pella said. “My mind was telling me that I should do the same, stay the same, but my legs and my body were empty. I was just too nervous.”

Despite her lack of experience on the big stage, No.274-ranked Pella kept her cool when it mattered most, dominating Pereira in the tiebreak and ousting the defending champion in two hours and twenty minutes.

The rest of the seeds in action advanced to the next round: No.5 Irina Falconi, No.6 Tatjana Maria and No.8 Anna Tatishvilli eased past their first round opponents in straight sets.

However, the extended rain delay left several matches rescheduled, including the struggle between No.1 seed Elina Svitolina and Alexandra Panova. After dropping the first set to the Russian 7-5, Svitolina came roaring back in the second. She looked set to stage her comeback, rolling to a 5-1 lead, when the rain halted play.