1958 Thomas Cup knockout stage

Indonesia went on to comfortably defeat Thailand in the inter-zone final 8–1. In another bad sign for Malaya, Thailand 's top two singles players, Charoen Wattanasin and Thanoo Khajadbhye, respected internationals who had dropped only one singles match between them in the campaign prior to playing Indonesia, were each decisively beaten by both Sonneville and Tan Joe Hok. Thailand won one doubles, though all four of these matches went to three games.

Indonesia 8	Singapore Badminton Stadium, Singapore 10–11 June 1958 [7][8]		Thailand 1
1 2 3 1 Tan Joe Hok Charoen Wattanasin 15 10 15 6     2 Ferry Sonneville Thanoo Khadjadbhye 11 5 13 7     3 Njoo Kiem Bie / Tan King Gwan Sunthorn Subabandhu / Kamal Sudthivanich 15 12 8 15 15 5   4 Lie Poo Djian / Tan Joe Hok Charoen Wattanasin / Prida Wongakrakul 7 15 15 9 15 10   5 Ferry Sonneville Charoen Wattanasin 15 10 15 2     6 Eddy Yusuf Pinit Pattabongse 15 10     retired   7 Tan Joe Hok Thanoo Khadjadbhye 15 1 15 8     8 Njoo Kiem Bie / Tan King Gwan Charoen Wattanasin / Prida Wongakrakul 15 8 11 15 15 8   9 Lie Poo Djian / Tan Joe Hok Sunthorn Subabandhu / Kamal Sudthivanich 15 6 3 15 0 15

The challenge round played in the middle of June brought Malaya's nine year Thomas Cup reign to an end. With Wong Peng Soon and Ong Poh Lim retired, Eddie Choong's game showing recent vulnerability, and some controversy over the selection of team members still percolating, Malayan confidence might have been low from the start. The three-time defending champions were unable to win any of the singles matches against Indonesia and eventually lost the tie 3–6.

Choong was twice beaten routinely in straight games and was booed off the court by his countrymen. Malaya's other top singles player, Teh Kew San, nearly broke through against Sonneville but finally went down 16–18 in the third. At least one of Malaya's doubles wins appeared to be a gift after the outcome had been determined. Indonesia's Tan Joe Hok went through the entire Thomas Cup campaign undefeated in singles (Sonneville had dropped a match to Finn Kobbero). Tan would win the All-England singles title the following year and for a time would be regarded as the best player in the world. For a much longer time Indonesia would be the country to beat in international team badminton.

Malaya 3	Singapore Badminton Stadium, Singapore 14–15 June 1958 [9][10]		Indonesia 6
1 2 3 1 Eddy Choong Ferry Sonneville 12 15 4 15     2 Teh Kew San Tan Joe Hok 14 18 4 15     3 Johnny Heah / Lim Say Hup Njoo Kiem Bie / Tan King Gwan 15 7 8 15 15 18   4 Eddy Choong / Ooi Teik Hock Ferry Sonneville / Tan Joe Hok 18 15 15 5     5 Eddy Choong Tan Joe Hok 11 15 6 15     6 Teh Kew San Ferry Sonneville 15 13 13 15 16 18   7 Abdullah Piruz Eddy Yusuf 15 6 10 15 8 15   8 Eddy Choong / Ooi Teik Hock Njoo Kiem Bie / Tan King Gwan 13 15 15 9     retired 9 Johnny Heah / Lim Say Hup Ferry Sonneville / Tan Joe Hok 15 1 15 1