Sithole made a strong start in the contest by securing the opening set 6-1, but Silva would recover to edge a tie-break in the second to force a decider.

The Brazilian player was unable to continue his momentum, as Sithole regained control to secure a 6-1, 6-7, 6-0 win.

Sithole will now face world number two David Wagner in the semi-finals, with the American having eased past Canada’s Mika Ishikawa 6-1, 6-1.

Australia’s Heath Davidson earned his place in the last four by overcoming the United States’ Bryan Barten 6-4, 6-4, while Andy Lapthorne overcame his British team-mate 6-1, 6-0.

The men’s and women’s doubles competitions got underway today, with their singles events taking a break.

Britain’s Alfie Hewett and Maikel Scheffers of the Netherlands secured a 6-2, 6-1 win over the American pairing of Chris Herman and Casey Ratzlaff.

They will now take on South Korea’s Sung-Bong Han and Ha-Gel Lee, who were 6-0, 6-0 winners against Argentina’s Oscar Diaz and Australia’s Keegan Oh-Chee.

The second semi-final will feature Argentina’s Ezequiel Casco and Brazil’s Daniel Rodrigues, as they defeated Diego Fernando Cortes Bernal of Colombia and Puerto Rico’s Oscar Marrero by a 6-0, 6-2 score.

South Africa’s Evans Maripa and Stefan Olsson of Sweden will provide the opposition, having edged out Japan’s Satoshi Saida and Australia’s Ben Weekes 6-2. 7-6.

In the women’s competition, American Shelby Baron and Japan’s Manami Tanaka were among the winners as they triumphed 6-2, 6-0 against Chile’s Francisca Mardones and Argentina’s Maria Florencia Moreno.

Britain’s Lucy Shuker and Dana Mathewson of the United States convincingly beat Japan’s Saki Takamuro and American Elizabeth Williams 6-0, 6-1.