Camila Osorio pulled off the biggest win of her career defeating No.1 seed Elina Svitolina.
Elina Svitolina has been shocked after crashing out of the WTA Tour's Tenerife Ladies Open in the first round.
The World No.6 was taking on 19-year-old Camila Osorio in the first round when bad light interrupted play.
The Ukraine world No.6 led by a set against Osorio, overnight, and when play resumed on Wednesday took a 2-0 advantage to appear on course for a routine win.
World No.63 produced some sublime tennis after she rattled off five games in a row on her way to forcing a deciding set.
The Colombian then won the final four game of the encounter to seal a comeback 5-7, 6-3, 6-2 victory. Fans were stunned to see the World No.6 fall in the first round of the tournament.
Camila Osorio the 19-year-old had not got past the opening round in five of her past six tournaments but proved too good for Svitolina.
The 63rd-ranked Osorio will play Egypt's World No.64 Mayar Sherif for a quarter-final spot. Already through to the last eight are a trio of unseeded players - after Svitolina's defeat meant six of the eight seeded players were bundled out in the opening round.