World number 74 stunned the back-to-back Pan American champion 3-11, 11-7, 8-11, 11-7, 11-6, 11-4 at the Durban International Convention Centre in the South African city.

Calderano was tipped to go far into the tournament, with two World Table Tennis Series titles to his name this year and a semi-final appearance at the Singapore Smash.

Afanador's reward is a second-round tie against Denmark's Anders Lind, ranked 173rd in the world, who himself caused a shock by beating world number 46 João Monteiro 11-8, 10-12, 11-3, 9-11, 11-9, 11-7.

There was better luck for another Portuguese player in world number 46 João Geraldo, who knocked out the 21st seed Liam Pitchford of England 12-10, 6-11, 11-9, 7-11, 11-5, 5-11, 13-11.

Second seed Wang Chuqin of China had no such difficulty, seeing off Tahiti's Ocean Belrose 11-2, 11-4, 11-7, 9-11, 11-3 to seal a second-round tie against world number 48 Shunsuke Togami of Japan.

Togami staved off Czech Republic's Tomáš Polanský 11-3, 13-15, 11-8, 11-7, 11-7.

In the women's singles, Andreea Dragoman of Romania starred on the second day with a straight games win against Chinese Taipei's 22nd seed Chen Szu-yu 13-11, 12-10, 11-2, 11-6.

The 15-year-old Egyptian star Hana Goda impressed in her 11-7, 11-5, 11-3, 9-11, 13-11 win against Switzerland's Rachel Moret.

China's fourth seed Wang Yidi cruised past Mateja Jeger of Croatia 11-2, 11-5, 11-3, 11-2, as did Japan's Olympic bronze medallist Mima Ito 11-4, 11-7, 11-9, 11-1 against Kazakhstan's Zauresh Akasheva.

Second round action at the ITTF World Table Tennis Championships Finals is set to begin tomorrow.